已知2x²-6x-﹙1/2﹚˜²=0,求x²-3x/x⁴-6x³+9x²的值.

问题描述:

已知2x²-6x-﹙1/2﹚˜²=0,求x²-3x/x⁴-6x³+9x²的值.

∵2x²-6x-﹙1/2﹚˜²=0
∴x²-3x=1/8
(x²-3x)/(x⁴-6x³+9x²)
=(x²-3x)/(x²-3x)²
=1/(x²-3x)
=1/(-1/8)
=-8