=-1/2=-0,5
1)4/15×(-5/8)=-1/6
2)3/4×(-4/9)=-1/3
3)-1/6+(-1/3)=-1/6-1/3=-1/6-2/6=-3/6=-1/2
A + 50 = 40 + 50=90
a + 50 = 50 + 50 = 100
a + 50 = 0 + 50 = 50
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b + 30 = 90 + 30 = 120
b + 30 = 70 + 30 = 100
b + 30 = 100 + 30 = 130
Высота равна 8см№64*8=512 см3объем равен 512см3