Question

найдите значение выражения 1,5х-2у при х=13, у=0,3

Answer 1

3/2*1/3 - 2*3/10=0.5-0.6=-0.1

Answer 2

$1,5x-2y=2(0.75x-y)=2(frac{3}{4}x-y)\ 2(frac{3}{4}x-y)=2(frac{3}{4}*frac{1}{3}-0.3)=2(frac{1}{4}-0.3)=2(0.25-0.3)=\ =2*(-0.05)=-0.1$