1、(x²+x+3)(x²-x-3)
问题描述:
1、(x²+x+3)(x²-x-3)
答
(x²+x+3)(x²-x-3)
=[x²+(x+3)][x²-(x+3)]
=(x²)²-(x+3)²
=x的四次方-x²-6x-9
注:平方差