化简 (1+x)^5 +(1-x)^5

问题描述:

化简 (1+x)^5 +(1-x)^5

(1+x)^5+(1-x)^5
=x^5+5x^4+10x³+10x²+5x+1-x^5+5x^4-10x³+10x²-5x+1
=10x^4+20x²+2