来自茹锋的问题
(3x+y)²-(x-5y)²
(3x+y)²-(x-5y)²
1回答
2020-09-1506:35
(3x+y)²-(x-5y)²
(3x+y)²-(x-5y)²
(3x+y)²-(x-5y)²
=(3x+y+x-5y)(3x+y-x+5y)
=(4x-4y)(2x+6y)
=8(x-y)(x+3y)