x-5分之x-4-x-6分之x-5=x-8分之x-7-x-9分之x-8
问题描述:
x-5分之x-4-x-6分之x-5=x-8分之x-7-x-9分之x-8
答
因为(x-4)/(x-5)=[(x-5)+1]/(x-5)=1+1/(x-5)……所以原方程可化为1+1/(x-5)-1-1/(x-6)=1+1/(x-8)-1-1/(x-9)1/(x-5)-1/(x-6)=1/(x-8)-1/(x-9)通分:-1/[(x-5)(x-6)]=-1/[(x-8)(x-9)](x-5)(x-6)=(x-8)(x-9)x^2...