1、(x²+x+3)(x²-x-3)

问题描述:

1、(x²+x+3)(x²-x-3)

(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