(x+1)(x+2)(x+3)(x+4)-15
问题描述:
(x+1)(x+2)(x+3)(x+4)-15
答
原式=[(x+1)(x+4)][(x+2)(x+3)]=(x²+5x+4)(x²+5x+6)=[(x²+5x)]²+10(x²+5x)+24=x^4+10x^3+25x²+10x²+50x+24=x^4+10x^3+35x²+50x+24