计算题:(2x+y)(3x+2y)-(x-y)^2

问题描述:

计算题:(2x+y)(3x+2y)-(x-y)^2

6x^+4xy+3xy+2y^-(x^+y^-2xy)=6x^+7xy+2y^-x^-y^+2xy=5x^+9xy+y^