Verified answer

1) 18×(-5)=-(18×5)=-90

-2,5×4=-(2,5×4)=-10

7/24×(-8)=-7/24×8=-7/3=-2,3

-14/15×(-3/7)=14/15×3/7=2/15×3=2/5

2)-1 1/3×1/2=-4/3×1/2=-2/3

-3,28×(-2,5)=3,28×2,5=8,2

3 4/7×(-1,4)=25/7×(-7/5)=-5

3) (-4)²=4²=16

(-2/3)³=-(2/3)³=-2³/3³=-8/27

(-0,1)⁴=(-1/10)⁴=1/10000