Question

упростите выражение (2x-y)(2x+y)-(2x+y)²

Answer 1

1. 4x²+2xy-2xy-y²-(4x²+4xy+y²)=-4xy-2y²

Answer 2

(2x-y)(2x+y)=4x²-y²

Answer 3

(2x-y)(2x+y)-(2x+y)²=4x²-y²-(4x²+4xy+y²)=4x²-y²-4x²-4xy-y²=-y²-4xy-y²=-2y²-4xy

Answer 4

спасибо

Answer 5

(2x-y)(2x+y)-(2x+y)²=4x²-y²-(4x²+4xy+y²)=4x²-y²-4x²-4xy-y²=-y²-4xy-y²=-2y²-4xy