Question

(1/7x-1/8y)(7y-8x)+(1/7y-1/8x)(7x-8y)​
Упростить выражение.

Answer 1

$(\frac{1}{7}x-\frac{1}{8}y)(7y-8x)+(\frac{1}{7}y-\frac{1}{8}x)(7x-8y)=\frac{8x-7y}{56}*(7y-8x)+\frac{8y-7x}{56}*(7x-8y)=-\frac{1}{56}-\frac{1}{56}=-\frac{2}{56}=-\frac{1}{28}\\\\Otvet:\boxed{-\frac{1}{28}}$