(x+4y)^2-(2x-y)^2因式分解 把上面的因式分解掉

问题描述:

(x+4y)^2-(2x-y)^2因式分解 把上面的因式分解掉

(x+4y)^2-(2x-y)^2
=(x+4y-2x+y)(x+4y+2x-y)
=(5y-x)(3x+3y)
=3(5y-x)(x+y)

(x+4y)^2-(2x-y)^2
=[(x+4y)+(2x-y)][(x+4y)-(2x-y)]
=(3x+3y)(-x+5y)
=3(x+1)(5y-x)