| 1. |
info: 2025-04-26 01:59:45.988 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
5ms [Parameters=[@p7='2b6a69e3-29ad-40e2-bb9c-bf0fe87c6a14', @p0='True', @p1='False', @p2='6', @p3='4ec59249-642a-4fdc-a934-e1ff406309b4', @p4='115.jpg' (Size = 100), @p5='https://knowledgenest.blob.core.windows.net/scanners/0/[Matematika][Horizontai Matematika 10 klasė][Vadovėlis 1 dalis]/pages/115.jpg' (Size = 1000), @p6='Pirmasis statybininkas, dirbdamas vienas, sumūrytų sieną 8 valandomis greičiau negu antrasis, todėl sudarome pirmąją lygtį: y - x = 8.
Du statybininkai sumūrija sieną per 7,5 valandos, todėl sudarome antrąją lygtį: 7,5/x + 7,5/y = 1.
Sudarome lygčių sistemą ir ją išsprendžiame:
```
{
y - x = 8,
7,5/x + 7,5/y = 1
```
Sąlygos: xy ≠ 0, x ≠ 0, y ≠ 0.
```
y = x + 8,
7,5y + 7,5x = xy,
7,5(x + 8) + 7,5x = x(x + 8),
x₁ = -5 (netinka pagal uždavinio sąlygą),
x₂ = 12.
```
Kai x = 12, tai y = 20.
*Alternatyvus sprendimas:*
Jei pirmojo statybininko laikas yra x, o antrojo y = x + 8, tada:
`7,5/x + 7,5/(x+8) = 1`
Sąlygos: x(x + 8) ≠ 0, x ≠ 0, x ≠ -8.
Išsprendę lygtį gauname:
x₁ = -5 (netinka),
x₂ = 12.
Pirmasis statybininkas sumūrija sieną per 12 h, antrasis - per 12 + 8 = 20 valandų.
**Atsakymas.** Pirmasis statybininkas - per 12 valandų, antrasis - per 20 valandų.
### 5 pavyzdys
Du plastiko butelių perdirbimo aparatai, paleisti kartu, galėtų perdirbti visą plastiko butelių partiją per 8 dienas. Jei pusę visų butelių perdirbtų vienas aparatas, o kitą pusę - kitas, darbas būtų baigtas per 18 dienų. Per kiek dienų perdirbtų visą plastiko butelių partiją kiekvienas aparatas, dirbdamas atskirai?
**Sprendimas**
Uždavinio sąlygoje nenurodyta, kiek butelių reikia perdirbti, todėl darbą laikome vienetu.
| Aparatas | Laikas, per kurį darbas atliekamas atskirai (dienomis) | Laikas, per kurį pusė darbo atliekama atskirai (dienomis) | Per 1 dieną atlikto darbo dalis |
|---|---|---|---|
| Pirmasis aparatas | x | 0,5x | 1/x |
| Antrasis aparatas | y | 0,5y | 1/y |
Pusę butelių pirmasis aparatas perdirba per 0,5x dienų.
Kitą pusę butelių antrasis aparatas perdirba per 0,5y dienų.
Darbas trunka iš viso 18 dienų, todėl:
`0,5x + 0,5y = 18`' (Size = 4000)], CommandType='Text', CommandTimeout='30']
SET IMPLICIT_TRANSACTIONS OFF;
SET NOCOUNT ON;
UPDATE [ScannerPages] SET [Active] = @p0, [Deleted] = @p1, [Position] = @p2, [ScannerId] = @p3, [StorageMediaName] = @p4, [StorageMediaUrl] = @p5, [Text] = @p6
OUTPUT 1
WHERE [Id] = @p7;
|
| 2. |
info: 2025-04-26 01:59:47.638 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
10ms [Parameters=[@__id_0='071f80f6-c33f-1054-5b65-bc3bd4ba18df', @__site_Id_1='63d6eb4e-8e39-4ac6-8f69-55ee76feccce'], CommandType='Text', CommandTimeout='30']
SELECT [c].[Id], [c].[Active], [c].[Deleted], [c].[Description], [c].[DescriptionBackup], [c].[Left], [c].[ParentId], [c].[Position], [c].[ProcessorGenerateImagePrompt], [c].[Right], [c].[SiteId], [c].[StorageMediaName], [c].[StorageMediaUrl], [c].[Title], [c].[TitleBackup], [c].[TitleSlug], [c].[TotalChildren], [c].[TotalScanners], [c].[TotalYoutubeVideos]
FROM [Categories] AS [c] WITH (NOLOCK)
WHERE [c].[Id] = @__id_0 AND [c].[SiteId] = @__site_Id_1 AND [c].[Active] = CAST(1 AS bit) AND [c].[Deleted] = CAST(0 AS bit)
ORDER BY [c].[Id]
|
| 3. |
info: 2025-04-26 01:59:47.646 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
2ms [Parameters=[@__id_0='071f80f6-c33f-1054-5b65-bc3bd4ba18df', @__site_Id_1='63d6eb4e-8e39-4ac6-8f69-55ee76feccce'], CommandType='Text', CommandTimeout='30']
SELECT [c4].[Id], [c4].[Active], [c4].[Deleted], [c4].[Description], [c4].[DescriptionBackup], [c4].[Left], [c4].[ParentId], [c4].[Position], [c4].[ProcessorGenerateImagePrompt], [c4].[Right], [c4].[SiteId], [c4].[StorageMediaName], [c4].[StorageMediaUrl], [c4].[Title], [c4].[TitleBackup], [c4].[TitleSlug], [c4].[TotalChildren], [c4].[TotalScanners], [c4].[TotalYoutubeVideos], [c].[Id]
FROM [Categories] AS [c] WITH (NOLOCK)
INNER JOIN (
SELECT [c0].[Id], [c0].[Active], [c0].[Deleted], [c0].[Description], [c0].[DescriptionBackup], [c0].[Left], [c0].[ParentId], [c0].[Position], [c0].[ProcessorGenerateImagePrompt], [c0].[Right], [c0].[SiteId], [c0].[StorageMediaName], [c0].[StorageMediaUrl], [c0].[Title], [c0].[TitleBackup], [c0].[TitleSlug], [c0].[TotalChildren], [c0].[TotalScanners], [c0].[TotalYoutubeVideos]
FROM [Categories] AS [c0] WITH (NOLOCK)
WHERE [c0].[Active] = CAST(1 AS bit) AND [c0].[Deleted] = CAST(0 AS bit)
) AS [c4] ON [c].[Id] = [c4].[ParentId]
WHERE [c].[Id] = @__id_0 AND [c].[SiteId] = @__site_Id_1 AND [c].[Active] = CAST(1 AS bit) AND [c].[Deleted] = CAST(0 AS bit)
ORDER BY [c].[Id], [c4].[Position], [c4].[Id]
|
| 4. |
info: 2025-04-26 01:59:47.654 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
8ms [Parameters=[@__id_0='071f80f6-c33f-1054-5b65-bc3bd4ba18df', @__site_Id_1='63d6eb4e-8e39-4ac6-8f69-55ee76feccce'], CommandType='Text', CommandTimeout='30']
SELECT [s5].[ScannerId], [s5].[CategoryId], [s5].[Id], [s5].[Active], [s5].[CheatSheet], [s5].[CheatSheet2], [s5].[Deleted], [s5].[FactErrors], [s5].[FactErrorsExplanation], [s5].[ParentCategory2Id], [s5].[ParentCategoryId], [s5].[ProcessorGenerateImagePrompt], [s5].[Prompt], [s5].[Reference], [s5].[ReferenceSlug], [s5].[SiteId], [s5].[SpellingErrors], [s5].[SpellingErrorsExplanation], [s5].[Summary], [s5].[Title], [s5].[TitleBackup], [s5].[TitleSlug], [s5].[TotalCards], [s5].[TotalCards2], [s5].[TotalCategories], [s5].[TotalPages], [s5].[Verified], [c].[Id]
FROM [Categories] AS [c] WITH (NOLOCK)
INNER JOIN (
SELECT [c3].[ScannerId], [c3].[CategoryId], [s1].[Id], [s1].[Active], [s1].[CheatSheet], [s1].[CheatSheet2], [s1].[Deleted], [s1].[FactErrors], [s1].[FactErrorsExplanation], [s1].[ParentCategory2Id], [s1].[ParentCategoryId], [s1].[ProcessorGenerateImagePrompt], [s1].[Prompt], [s1].[Reference], [s1].[ReferenceSlug], [s1].[SiteId], [s1].[SpellingErrors], [s1].[SpellingErrorsExplanation], [s1].[Summary], [s1].[Title], [s1].[TitleBackup], [s1].[TitleSlug], [s1].[TotalCards], [s1].[TotalCards2], [s1].[TotalCategories], [s1].[TotalPages], [s1].[Verified]
FROM [CategoryScanners] AS [c3]
INNER JOIN [Scanners] AS [s1] ON [c3].[ScannerId] = [s1].[Id]
WHERE [s1].[Active] = CAST(1 AS bit) AND [s1].[Deleted] = CAST(0 AS bit)
) AS [s5] ON [c].[Id] = [s5].[CategoryId]
WHERE [c].[Id] = @__id_0 AND [c].[SiteId] = @__site_Id_1 AND [c].[Active] = CAST(1 AS bit) AND [c].[Deleted] = CAST(0 AS bit)
ORDER BY [c].[Id], [s5].[Id], [s5].[ScannerId], [s5].[CategoryId]
|
| 5. |
info: 2025-04-26 01:59:47.702 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
21ms [Parameters=[@__id_0='071f80f6-c33f-1054-5b65-bc3bd4ba18df', @__site_Id_1='63d6eb4e-8e39-4ac6-8f69-55ee76feccce'], CommandType='Text', CommandTimeout='30']
SELECT [s6].[Id], [s6].[Active], [s6].[Context], [s6].[ContextBackup], [s6].[ContextStorageMediaName], [s6].[ContextStorageMediaUrl], [s6].[Deleted], [s6].[FactErrors], [s6].[FactErrorsExplanation], [s6].[Facts], [s6].[FactsBackup], [s6].[FactsStorageMediaName], [s6].[FactsStorageMediaUrl], [s6].[Position], [s6].[ProcessorGenerateImagePrompt], [s6].[Prompt], [s6].[ScannerId], [s6].[SpellingErrors], [s6].[SpellingErrorsExplanation], [s6].[StorageMediaName], [s6].[StorageMediaUrl], [s6].[Summary], [s6].[SummaryBackup], [s6].[SummaryStorageMediaName], [s6].[SummaryStorageMediaUrl], [s6].[Title], [s6].[TitleSlug], [s6].[TotalFillTheBlankSelectionQuestions], [s6].[TotalMultipleSelectionQuestions], [s6].[TotalOrderingQuestions], [s6].[TotalQuestionPoints], [s6].[TotalQuestions], [s6].[TotalShortAnswerQuestions], [s6].[TotalSingleSelectionQuestions], [s6].[TotalSources], [s6].[TotalTrueFalseQuestions], [s6].[Verified], [s6].[Version], [c].[Id], [s5].[ScannerId], [s5].[CategoryId], [s5].[Id]
FROM [Categories] AS [c] WITH (NOLOCK)
INNER JOIN (
SELECT [c3].[ScannerId], [c3].[CategoryId], [s1].[Id]
FROM [CategoryScanners] AS [c3]
INNER JOIN [Scanners] AS [s1] ON [c3].[ScannerId] = [s1].[Id]
WHERE [s1].[Active] = CAST(1 AS bit) AND [s1].[Deleted] = CAST(0 AS bit)
) AS [s5] ON [c].[Id] = [s5].[CategoryId]
INNER JOIN (
SELECT [s2].[Id], [s2].[Active], [s2].[Context], [s2].[ContextBackup], [s2].[ContextStorageMediaName], [s2].[ContextStorageMediaUrl], [s2].[Deleted], [s2].[FactErrors], [s2].[FactErrorsExplanation], [s2].[Facts], [s2].[FactsBackup], [s2].[FactsStorageMediaName], [s2].[FactsStorageMediaUrl], [s2].[Position], [s2].[ProcessorGenerateImagePrompt], [s2].[Prompt], [s2].[ScannerId], [s2].[SpellingErrors], [s2].[SpellingErrorsExplanation], [s2].[StorageMediaName], [s2].[StorageMediaUrl], [s2].[Summary], [s2].[SummaryBackup], [s2].[SummaryStorageMediaName], [s2].[SummaryStorageMediaUrl], [s2].[Title], [s2].[TitleSlug], [s2].[TotalFillTheBlankSelectionQuestions], [s2].[TotalMultipleSelectionQuestions], [s2].[TotalOrderingQuestions], [s2].[TotalQuestionPoints], [s2].[TotalQuestions], [s2].[TotalShortAnswerQuestions], [s2].[TotalSingleSelectionQuestions], [s2].[TotalSources], [s2].[TotalTrueFalseQuestions], [s2].[Verified], [s2].[Version]
FROM [ScannerCards] AS [s2]
WHERE [s2].[Active] = CAST(1 AS bit) AND [s2].[Deleted] = CAST(0 AS bit)
) AS [s6] ON [s5].[Id] = [s6].[ScannerId]
WHERE [c].[Id] = @__id_0 AND [c].[SiteId] = @__site_Id_1 AND [c].[Active] = CAST(1 AS bit) AND [c].[Deleted] = CAST(0 AS bit)
ORDER BY [c].[Id], [s5].[Id], [s5].[ScannerId], [s5].[CategoryId], [s6].[TitleSlug], [s6].[Id]
|
| 6. |
info: 2025-04-26 01:59:47.711 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
2ms [Parameters=[@__id_0='071f80f6-c33f-1054-5b65-bc3bd4ba18df', @__site_Id_1='63d6eb4e-8e39-4ac6-8f69-55ee76feccce'], CommandType='Text', CommandTimeout='30']
SELECT [q0].[Id], [q0].[Active], [q0].[Created], [q0].[Deleted], [q0].[Points], [q0].[ProcessorGenerateImagePrompt], [q0].[ScannerCardId], [q0].[StorageMediaName], [q0].[StorageMediaUrl], [q0].[Title], [q0].[TotalAnswers], [q0].[Type], [c].[Id], [s5].[ScannerId], [s5].[CategoryId], [s5].[Id], [s6].[Id]
FROM [Categories] AS [c] WITH (NOLOCK)
INNER JOIN (
SELECT [c3].[ScannerId], [c3].[CategoryId], [s1].[Id]
FROM [CategoryScanners] AS [c3]
INNER JOIN [Scanners] AS [s1] ON [c3].[ScannerId] = [s1].[Id]
WHERE [s1].[Active] = CAST(1 AS bit) AND [s1].[Deleted] = CAST(0 AS bit)
) AS [s5] ON [c].[Id] = [s5].[CategoryId]
INNER JOIN (
SELECT [s2].[Id], [s2].[ScannerId], [s2].[TitleSlug]
FROM [ScannerCards] AS [s2]
WHERE [s2].[Active] = CAST(1 AS bit) AND [s2].[Deleted] = CAST(0 AS bit)
) AS [s6] ON [s5].[Id] = [s6].[ScannerId]
INNER JOIN (
SELECT [q].[Id], [q].[Active], [q].[Created], [q].[Deleted], [q].[Points], [q].[ProcessorGenerateImagePrompt], [q].[ScannerCardId], [q].[StorageMediaName], [q].[StorageMediaUrl], [q].[Title], [q].[TotalAnswers], [q].[Type]
FROM [Questions] AS [q]
WHERE [q].[Active] = CAST(1 AS bit) AND [q].[Deleted] = CAST(0 AS bit)
) AS [q0] ON [s6].[Id] = [q0].[ScannerCardId]
WHERE [c].[Id] = @__id_0 AND [c].[SiteId] = @__site_Id_1 AND [c].[Active] = CAST(1 AS bit) AND [c].[Deleted] = CAST(0 AS bit)
ORDER BY [c].[Id], [s5].[Id], [s5].[ScannerId], [s5].[CategoryId], [s6].[TitleSlug], [s6].[Id], [q0].[Id]
|
| 7. |
info: 2025-04-26 01:59:47.714 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
2ms [Parameters=[@__id_0='071f80f6-c33f-1054-5b65-bc3bd4ba18df', @__site_Id_1='63d6eb4e-8e39-4ac6-8f69-55ee76feccce'], CommandType='Text', CommandTimeout='30']
SELECT [s7].[TagId], [s7].[ScannerCardId], [s7].[Id], [s7].[Active], [s7].[Created], [s7].[Deleted], [s7].[Description], [s7].[Links], [s7].[MediaSourceCopyright], [s7].[MediaSourceUrl], [s7].[ShortDescription], [s7].[SiteId], [s7].[StorageMediaName], [s7].[StorageMediaUrl], [s7].[Title], [s7].[TitleSlug], [s7].[Url], [s7].[Wikipedia], [s7].[WikipediaPageId], [s7].[WikipediaUpdated], [c].[Id], [s5].[ScannerId], [s5].[CategoryId], [s5].[Id], [s6].[Id]
FROM [Categories] AS [c] WITH (NOLOCK)
INNER JOIN (
SELECT [c3].[ScannerId], [c3].[CategoryId], [s1].[Id]
FROM [CategoryScanners] AS [c3]
INNER JOIN [Scanners] AS [s1] ON [c3].[ScannerId] = [s1].[Id]
WHERE [s1].[Active] = CAST(1 AS bit) AND [s1].[Deleted] = CAST(0 AS bit)
) AS [s5] ON [c].[Id] = [s5].[CategoryId]
INNER JOIN (
SELECT [s2].[Id], [s2].[ScannerId], [s2].[TitleSlug]
FROM [ScannerCards] AS [s2]
WHERE [s2].[Active] = CAST(1 AS bit) AND [s2].[Deleted] = CAST(0 AS bit)
) AS [s6] ON [s5].[Id] = [s6].[ScannerId]
INNER JOIN (
SELECT [t].[TagId], [t].[ScannerCardId], [t0].[Id], [t0].[Active], [t0].[Created], [t0].[Deleted], [t0].[Description], [t0].[Links], [t0].[MediaSourceCopyright], [t0].[MediaSourceUrl], [t0].[ShortDescription], [t0].[SiteId], [t0].[StorageMediaName], [t0].[StorageMediaUrl], [t0].[Title], [t0].[TitleSlug], [t0].[Url], [t0].[Wikipedia], [t0].[WikipediaPageId], [t0].[WikipediaUpdated]
FROM [TagScannerCards] AS [t]
INNER JOIN [Tags] AS [t0] ON [t].[TagId] = [t0].[Id]
WHERE [t0].[Active] = CAST(1 AS bit) AND [t0].[Deleted] = CAST(0 AS bit)
) AS [s7] ON [s6].[Id] = [s7].[ScannerCardId]
WHERE [c].[Id] = @__id_0 AND [c].[SiteId] = @__site_Id_1 AND [c].[Active] = CAST(1 AS bit) AND [c].[Deleted] = CAST(0 AS bit)
ORDER BY [c].[Id], [s5].[Id], [s5].[ScannerId], [s5].[CategoryId], [s6].[TitleSlug], [s6].[Id], [s7].[TitleSlug]
|
| 8. |
info: 2025-04-26 01:59:47.867 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
27ms [Parameters=[@__site_Id_0='63d6eb4e-8e39-4ac6-8f69-55ee76feccce', @__item_Left_1='14312', @__item_Right_2='14313'], CommandType='Text', CommandTimeout='30']
SELECT [c].[Id], [c].[Active], [c].[Deleted], [c].[Description], [c].[DescriptionBackup], [c].[Left], [c].[ParentId], [c].[Position], [c].[ProcessorGenerateImagePrompt], [c].[Right], [c].[SiteId], [c].[StorageMediaName], [c].[StorageMediaUrl], [c].[Title], [c].[TitleBackup], [c].[TitleSlug], [c].[TotalChildren], [c].[TotalScanners], [c].[TotalYoutubeVideos]
FROM [Categories] AS [c] WITH (NOLOCK)
WHERE [c].[SiteId] = @__site_Id_0 AND [c].[Left] <= @__item_Left_1 AND [c].[Right] >= @__item_Right_2 AND [c].[Deleted] = CAST(0 AS bit)
ORDER BY [c].[Left]
|
| 77 ms |
