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Mathematical problems, online, etc. thank you. You can solve them by equations, at least by formulas Fill in the blanks: The denominator of 5 out of 18 is reduced by 6. To keep the size of the fraction unchanged, the numerator should be () Mathematics application questions: 1. Cut and fill a parallelogram into a square. The perimeter of the square is 40cm. What is the area of the original parallelogram? 2. In the timber market, a batch of logs are piled up into a trapezoidal log pile. There are 5 logs at the top layer, and there are 10 more logs at the next layer than at the previous layer. How many logs are there in this pile? 2. A batch of logs are piled up in the timber market
Fill in the blanks minus 10 / 3
Application: s parallelogram = 100cm ^ 2, that is, 100cm ^ 2, C square = 40com, one side = 10cm
S parallel = S + s parallel = 100cm ^ 2
(2) Wood quantity = 100, the next layer has one more than the previous layer, and the tenth layer has 15, so (5 + 15) x (10 / 2) = 100
Mathematical problems of junior high school
1. To dig a canal 280 meters long, 5 meters wide and 3 meters deep, it takes 10 workers 12 hours a day and 7 days to dig it. Now, with the same working efficiency, 9 hours a day and 25 days to dig a canal 360 meters long, 5 meters wide and 5 meters deep, how many people are needed?
Step by step --
673836267,
Digging per person per hour:
(280 × 5 × 3) / (10 × 12 × 7) = 5 (M3)
The same efficiency should be achieved:
(360 × 5 × 5) / (25 × 9 × 5) = 8 (persons)
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