(2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算

问题描述:

(2x-y)(3x-4y)-2(x-y)(2x-5y)简便运算

原式=(6x²-8xy-3xy+4y²)-2(2x²-5xy-2xy+5y²)
=6x²-11xy+4y²-4x²+14xy-10y²
=2x²+3xy-6y²