(3x+2y)(2x-5y)-(x+y)(6x-7y)点用公式啊
问题描述:
(3x+2y)(2x-5y)-(x+y)(6x-7y)点用公式啊
平方差或完全平方
答
(3x+2y)(2x-5y)-(x+y)(6x-7y) =(6x^2-15xy+4xy-10y^2)-(6x^2-7xy+6xy-7y^2) =(6x^2-11xy-10y^2)-(6x^2-xy-7y^2) =6-10xy-3y^2 就这样了,没得化简了