1.1/6=1/2*3=1/2-1/3

问题描述:

1.1/6=1/2*3=1/2-1/3
1/12=1/3*4=1/3-1/4
1/20=1/4*5=1/4-1/5
2.利用以上的规律解下面的方程:
1/(x-2)(x-3)-3/(x-1)(x-4)+1/(x-1)(x-2)=1/x-4
1/(x-4) 有括号

1/(x-2)(x-3)-3/(x-1)(x-4)+1/(x-1)(x-2)=1/x-4
[1/(x-3)-1/(x-2)]-[1/(x-4)-1/(x-1)]+[1/(x-2)-1/(x-1)]=1/(x-4)
1/(x-3)-1/(x-4)=1/(x-4)
1/(x-3)=2/(x-4)
2(x-3)=x-4
2x-6=x-4
x=2
代入检验
则x=2时,1/(x-2)(x-3)分母为0,增根,舍去
所以方程无解