急 1/(x-5)-1/(x-6)-1/(x-8)+1/(x-9)=0求解

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急1/(x-5)-1/(x-6)-1/(x-8)+1/(x-9)=0求解急1/(x-5)-1/(x-6)-1/(x-8)+1/(x-9)=0求解急1/(x-5)-1/(x-6)-1/(x-8)+1/(

急 1/(x-5)-1/(x-6)-1/(x-8)+1/(x-9)=0求解
急 1/(x-5)-1/(x-6)-1/(x-8)+1/(x-9)=0求解

急 1/(x-5)-1/(x-6)-1/(x-8)+1/(x-9)=0求解
1/x-5-1/x-6-1/x-8+1/x-9=0
1/x-5+1/x-9=1/x-6+1/x-8
(2x-14)/(x-5)(x-9)=(2x-14)/(x-6)(x-8)
(2x-14)(x-6)(x-8)=(2x-14)(x-5)(x-9)
(2x-14)(x^2-14x+45)=(2x-14)(x^2-14x+48)
(x^2-14x+45)不等于(x^2-14x+48)
所以2x-14=0
x=7