Question

通分：a²-2a+1分之1与a²-1分之3

Answer 1

a²-2a+1=(a-1)²

a²-1=(a+1)(a-1)

所以最简公分母是(a+1)(a-1)²

所以1/(a²-2a+1)=(a+1)/(a+1)(a-1)²

3/(a²-1)=3(a-1)/(a+1)(a-1)²