4x/(5x-2)+(5x-2)/4x=17/4 解方程哦!

问题描述:

4x/(5x-2)+(5x-2)/4x=17/4 解方程哦!

4x/(5x-2)+(5x-2)/4x=17/4
令4x/(5x-2)=y
y+1/y=17/4
4y^2+4=17y
4y^2-17y+4=0
(4y-1)(y-4)=0
y=1/4或y=4
当y=1/4时
4x/(5x-2)=1/4
16x=5x-2
11x=-2
x=-2/11
当y=4时
4x/(5x-2)=4
x/(5x-2)=1
5x-2=x
4x=2
x=1/2
经检验x=-2/11,x=1/2是方程的解

x=1/2,x=-11/2

令t=4x/(5x-2)
原方程化为
t+1/t=17/4
解得
t=4,t=1/4

4x/(5x-2)=4,4x/(5x-2)=1/4
x=1/2,x=-2/11
经检验是原方程的解.

好好学习