Question

初一数学上册方程题只要方程不要应用题,

Answer 1

1/(x-10)+1/(x-6)=1/(x-7)+1/(x-9)

1/(x-10)-1/(x-9)=1/(x-7)-1/(x-6)

[(x-9)-(x-10)]/(x-10)(x-9)=[(x-6)-(x-7)]/(x-7)(x-6)

即是

1/（x-9)(x-10)=1/(x-6)(x-7)

x^2-13x+42=x^2-19x+90

6x=68

得出：x=8

经检验,X=8是方程的解