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2/(x-1) +[2/(x²-1) +1/(x+1) ]
=2/(x-1) +[2/(x²-1) +(x-1)/(x²-1)]
=2/(x-1) +[(2+x-1)/(x²-1)]
=2/(x-1) +(x+1)/(x²-1)
=2(x+1)/(x-1)(x+1) +(x+1)/(x²-1)
=(2x+2)/(x²-1) +(x+1)/(x²-1)
=(2x+2+x+1)/(x²-1)
=(3x+3)/(x²-1)
=3(x+1)/(x+1)(x-1)
=3/(x-1)
这就是化简的正确结果,所给四个选项都不对,可见题目有误。
=2/(x-1) +[2/(x²-1) +(x-1)/(x²-1)]
=2/(x-1) +[(2+x-1)/(x²-1)]
=2/(x-1) +(x+1)/(x²-1)
=2(x+1)/(x-1)(x+1) +(x+1)/(x²-1)
=(2x+2)/(x²-1) +(x+1)/(x²-1)
=(2x+2+x+1)/(x²-1)
=(3x+3)/(x²-1)
=3(x+1)/(x+1)(x-1)
=3/(x-1)
这就是化简的正确结果,所给四个选项都不对,可见题目有误。
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