x-5/x=9/8这种解方程怎么算?

问题描述:

x-5/x=9/8这种解方程怎么算?

x=11/2
原式可化为:1+(2/x-7)+1+(2/x-4)=1+(2/x-5)+1+(2/x-6)
(2/x-7)+(2/x-4)=(2/x-5)+(2/x-6)
(1/x-7)+(1/x-4)=(1/x-5)+(1/x-6)
(2x-11)/[(x-7)(x-4)]=(2x-11)/[(x-5)(x-6)]
(2x-11)/(x^2-11x+28)=(2x-11)/(x^2-11x+30)
则:若2x-11=0时,等式成立.即x=11/2
若2x-11不等于0时,式子可化为:
x^2-11x+28=x^2-11x+30
得28=30,无解.
所以该方程的结为x=11/2