Question

x-1分之1等于x的平方减1分之1 麻烦再回答下x的平方+x分之5x+2=x+1分之3

Answer 1

1/(x-1)=1/(x^2-1)
1/(x-1)-1/(x^2-1)=0
(x+1)/(x-1)(x+1)-1/(x-1)(x+1)=0
(x+1-1)/(x-1)(x+1)=0
x/(x-1)(x+1)=0
x=0
经检验x=0是方程的解