Question

Найдите значение выражения 0.6(4x-18)-0.4(5-7x) при x=2 4/13

Answer 1

$0.6(4x-18)-0.4(5-7x)=2,4x-10.8-2+2.8x=5.2x-12.8= \ = frac{26}{5}x- 12.8$

при $x=2 frac{4}{13}= frac{30}{13}$

$frac{26}{5}x- 12.8=frac{26}{5}* frac{30}{13} -12.8=12-12.8=-0.8$