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Fifteen answers to exercises in the first volume of mathematics book in fifth grade primary school.
1.S=ah=5*2.5= 125

3.h=s/a=28/7=4

4.250*84* 14.7=

It is an isosceles right triangle.

7. (18+15) * 2 = 66cm18 *15 = 270 (square centimeter) Reduce the area when drawing a parallelogram.

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