Упростите выражение: (x-y)-((x+xy)-(xy-y))

Question

Упростите выражение:

(x-y)-((x+xy)-(xy-y))

Answer 1

(x-y)-((x+xy)-(xy-y))=(x-y)-(x+xy-xy+y)=(x-y)-(x+y)=-2y

 

Answer 2

(x-y)-((x+xy)-(xy-y))=х-у-(х+ху-ху+у)=х-у-х-ху+ху-у=-2у