Question

2/x-1=4/4x平方-1 x-1和4x平方-1 是1个整体分母 要检验的哦

Answer 1

2/(x-1)=4/(4x^2-1)

等号两边分子分母交叉相乘得

4x^2-1=2(x-1)

等号右边移到左边,得

4x^2-2x+1=0

由于b^2-4ac