2(2x+3y)(3x+2y)-(6x-y)(2x-5y)
问题描述:
2(2x+3y)(3x+2y)-(6x-y)(2x-5y)
答
2(2x+3y)(3x+2y)-(6x-y)(2x-5y)
=12x^2+26xy+12y^2-(12x^2-32xy+5y^2)
=12x^2+26xy+12y^2-12x^2+32xy-5y^2
=58xy+7y^2谢谢,。