X-2乘以X-3分之2X-5减X-3分之1

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X-2乘以X-3分之2X-5减X-3分之1
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X-2乘以X-3分之2X-5减X-3分之1
X-2乘以X-3分之2X-5减X-3分之1

X-2乘以X-3分之2X-5减X-3分之1
(2x-5)/(x-2)(x-3)-1/(x-3) =(2x-5)/(x-2)(x-3)-(x-2)/(x-2)(x-3) =(2x-5-x+2)/(x-2)(x-3) =(x-3)/(x-2)(x-3) =1/(x-2)