题目
计算 x-1分之1 - x²-1分之x
提问时间:2020-08-07
答案
利用平方差公式通分
1/(x-1)-x/(x²-1)
=(x+1)/(x²-1)-x/(x²-1)
=1/(x²-1)
1/(x-1)-x/(x²-1)
=(x+1)/(x²-1)-x/(x²-1)
=1/(x²-1)
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