1/x-1-1/x+1-2/x的2次方+1

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1 | 2012-11-29 20:53:06 | 显示全部楼层 |阅读模式

原式=(x+1)/(x-1)(x+1)-(x-1)/(x-1)(x+1)-2/(x2+1)=(x+1-x+1)/(x-1)(x+1)-2/(x2+1)=2/(x2-1)-2/(x2+1)=2[(x2+1-x2+1)/(x2-1)(x2+1)=4/(x^4-1)...

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