Question

упростите выражение x(y-1)-((xy-x)-(y-xy))

Answer 1

$x(y-1)-((xy-x)-(y-xy))=xy-x-(xy-x-y+xy)=xy-x-xy$$+x+y-xy=y-xy$

Answer 2

x(y-1)-((xy-x)-(y-xy))=ху-х-(ху-х-у+ху)= ху-х-ху+х+у-ху=у-ху