1/x-5-1/x-6-1/x-8+1/x-9=0
1个回答

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