1/(x-2) -1/(x-3)=1/(x-6) -1/(x-7) 方程两边分别通分(x-3)/[(x-2)(x-3)] -(x-2)/[(x-2)(x-3)] =(x-7)/[(x-6)(x-7)] -(x-6)/[(x-6)(x-7)]-1/[(x-2)(x-3)] =-1/[(x-6)(x-7)] 方程两边同时乘最简公分母(x-2)(x-3)(x-6)...