计算:1/(x-2)(x-3)-2/(x-1)(x-3)+1/(x-1)(x-2)
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1/(x-2)(x-3)-2/(x-1)(x-3)+1/(x-1)(x-2)
=(x-1)/(x-2)(x-3)(x-1)-2(x-2)/(x-1)(x-2)(x-3)+(x-3)/(x-1)(x-2)(x-3)
=【x-1-2x+4+x-3】/(x-1)(x-2)(x-3)
=【0】/(x-1)(x-2)(x-3)
=0
=(x-1)/(x-2)(x-3)(x-1)-2(x-2)/(x-1)(x-2)(x-3)+(x-3)/(x-1)(x-2)(x-3)
=【x-1-2x+4+x-3】/(x-1)(x-2)(x-3)
=【0】/(x-1)(x-2)(x-3)
=0
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=1/(x-3)-1/(x-2)-1/(x-3)+1/(x-1)+1/(x-2)-1/(x-1)=0
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=[(x-1)-2(x-2)+(x-3)]/(x-1)(x-2)(x-3)
=0
=0
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