问一道数学较难的简便运算计算:1/(x-2)+2/(x+1)-2/(x-1) -1/(x+2).

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问一道数学较难的简便运算计算:1/(x-2)+2/(x+1)-2/(x-1)-1/(x+2).问一道数学较难的简便运算计算:1/(x-2)+2/(x+1)-2/(x-1)-1/(x+2).问一道数学较

问一道数学较难的简便运算计算:1/(x-2)+2/(x+1)-2/(x-1) -1/(x+2).
问一道数学较难的简便运算
计算:1/(x-2)+2/(x+1)-2/(x-1) -1/(x+2).

问一道数学较难的简便运算计算:1/(x-2)+2/(x+1)-2/(x-1) -1/(x+2).
计算:1/(x-2)+2/(x+1)-2/(x-1) -1/(x+2)
1/(x-2)+2/(x+1)-2/(x-1) -1/(x+2)
=1/(x-2)-1/(x+2)+2/(x+1)-2/(x-1)
=4/(x²-4)-2/(x²-1)
=(2x²+4)/(x²-4)(x²-1)

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