Question

1) 7· (-3/7)²
2) (-0,6)³ - (-0,5)³
3) (6³ ÷ 400+0,3³)÷(-0,1)²

Answer 1

$1)7*(- frac{3}{7} )^{2}=7* frac{9}{14}= frac{7*9}{14}= frac{9}{2}=4,5$

$2)(-0,6) ^{3} -(-0,5)^{3}=-0,216-(-0,125)=-0,216+0,125=-0.091$

$3) (6^{3}:400+0,3^{3}):(-0,1)^{2}=(216:400+0,027):0,01$$=(0,54+0,027):0,01=0,567:0,01=56,7$