(x-y)(3x-5y+2)
问题描述:
(x-y)(3x-5y+2)
答
(x-y)(3x-5y+2)
=3x^2-5xy+2x-3xy+5y^2-2y
=3x^2-8xy+2x-2y+5y^2
答
原式
(3x-5y+2)(x-y)
=3x²-5xy+2x-3xy+5y²-2y
=3x²-8xy+2x-2y+5y²