(1)原式
=[(x²+4)/x-4]÷ [(x²-4)/x(x+2)]
=[(x²+4)-4x]/x÷ (x-2)/x
=(x-2)²/x· x/(x-2)
=x-2
=-1-2
=-3
(2)
乘以(3x-1)(2x²-5)得
3(2x²-5)=2x(3x-1)
6x²-15=6x²-2x
2x=15
x=7.5
(1)原式
=[(x²+4)/x-4]÷ [(x²-4)/x(x+2)]
=[(x²+4)-4x]/x÷ (x-2)/x
=(x-2)²/x· x/(x-2)
=x-2
=-1-2
=-3
(2)
乘以(3x-1)(2x²-5)得
3(2x²-5)=2x(3x-1)
6x²-15=6x²-2x
2x=15
x=7.5