Question

2(x+y)平方+(x+y)(x-y)-6(x-y)平方的计算过程及结果

Answer 1

2(x+y)平方+(x+y)(x-y)-6(x-y)平方

=2x^2+4xy+2y^2+x^2-y^2- 6x^2+12xy-6y^2

=-3x^2+16xy-5y^2