若多项式3x²-2(1+1/23y-2x²)+mx²的值与x的值无关,则m等于?
问题描述:
若多项式3x²-2(1+1/23y-2x²)+mx²的值与x的值无关,则m等于?
答
m=-7
答
3x²-2(1+1/23y-2x²)+mx²
=3x²-2-2/23y+4x²+mx²
=(3+4+m)x²-2/23y-2
=(7+m)x²-2/23y-2
值与x无关
则7+m=0
m=-7