化简再求值:X^2+5X-14+(X+1)(X^2+2X+1)其中X=5
问题描述:
化简再求值:X^2+5X-14+(X+1)(X^2+2X+1)其中X=5
答
X^2+5X-14+(X+1)(X^2+2X+1)
=(x-2)(x+7)+(x+1)(x+1)
=(5-2)*(5+7)+(5+1)^2
=72