请数学厉害的大神解(3x²-xy-2y²)-2(x²+xy-2y²)(3x²-xy-2y²)-2(x²+xy-2y²)
来源：学生学帮网 编辑：学帮网 时间：2024/06/04 01:57:27
请数学厉害的大神解(3x²-xy-2y²)-2(x²+xy-2y²)
(3x²-xy-2y²)-2(x²+xy-2y²)
(3x²-xy-2y²)-2(x²+xy-2y²)
=3x²-xy-2y²-2x²-2xy+4y²
=x²-3xy+2y²
=(x-y)(x-2y)
请数学厉害的大神解(3x²-xy-2y²)-2(x²+xy-2y²)
(3x²-xy-2y²)-2(x²+xy-2y²)
(3x²-xy-2y²)-2(x²+xy-2y²)
=3x²-xy-2y²-2x²-2xy+4y²
=x²-3xy+2y²
=(x-y)(x-2y)