=（x-1)(x+1)*2(x-2)/x*(x+1)(x-2).（除数分子*被除数分母/（除数分母*被除数分子,即被除分数分子分母颠倒）
当x不等于-1和2时,结果为2(x-1)/x
x²-1/x²-x-2÷x/2x-4约分是?
x²-1/x²-x-2÷x/2x-4约分是?
呃 错了· 是化简、、
呃 错了· 是化简、、
数学人气：449 ℃时间：2020-04-15 08:47:55
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