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Multiple choice questions and fill-in-the-blank questions in fifth grade mathematics (the main process of scoring, mastering and writing)
1. 1.c Let the middle number be m, then the front number is (m- 1) and the back number is (m+ 1). Then add the three numbers, and the sum of the three numbers is 3m, and the minimum natural number is (m- 1).
2.c for example: 45? +45? =90? = right angle.
(1) Remember: the floor area of the pool has no upper part and periphery, only the bottom area.
So only the bottom area is calculated.
Therefore, the pool covers an area of 15x8 = 120m2.