(2x-5)/(x^2-5x+6)-1/(x-3)

題目：

(2x-5)/(x^2-5x+6)-1/(x-3)

解答：

(2x-5)/(x^2-5x+6)-1/(x-3)
=(2x-5-(x-2))/(x-2)(x-3)
=(x-3)/(x-2)(x-3)
=1/(x-2);
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