发布时间:2019-08-27 13:19:34
x²+3x(x-3)-9
=x²-9+3x(x-3)
=(x+3)(x-3)+3x(x-3)
=(x-3)[(x+3)+3x]
=(x-3)(4x+3)
如满意请给个满意答案
x²+3x(x-3)-9= x²-9+3x(x-3)=(x+3)(x-3)+3x(x-3)=(x-3)(x+3+3x)=(x-3)(4x+3)