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The answer to the question p6 1 page 5.6.7 in the first volume of the mathematics evaluation manual of the first day of the Jiangsu Education Edition is urgent! ! ! ! ! ! ! !
5 .. perimeter 2a+2b, area 2c+c(a-c)

6. Figure1101/414 25/4

Figure 2 5 2 5/4 1 2 3/4

7 First question: Solution: The formula is (10a+b)-(10b+a) = 9 (a-b). I know it can be divisible by 9, because it is a multiple of 9.

Divisible by 9.

The second question: the sum of the solutions is (10a+b)+(10b+a) = 1 1 (a+b), so I understand that the sum of these formulas can be11integer.

I called myself! ! !

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