Question

У простите вырожение. (x+2y)в2-(x-2y)в 2 =

Answer 1

b^2(x+2y-(x-2y)=
=b^2(x+2y-x+2y)=
=b^2*4y=4yb^2

Answer 2

=x2+4xy+4y2-x2+4xy-4y2=8xy

Answer 3

Молодец