(a-1)/(a-2)乘(2a-4)/(a的平方-3a+2)

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(a-1)/(a-2)乘(2a-4)/(a的平方-3a+2)(a-1)/(a-2)乘(2a-4)/(a的平方-3a+2)(a-1)/(a-2)乘(2a-4)/(a的平方-3a+2)原式=(a-1)/(

(a-1)/(a-2)乘(2a-4)/(a的平方-3a+2)
(a-1)/(a-2)乘(2a-4)/(a的平方-3a+2)

(a-1)/(a-2)乘(2a-4)/(a的平方-3a+2)
原式=(a-1)/(a-2)×2(a-2)/(a-1)(a-2)
=(a-1)/(a-2)×2/(a-1)
=2/(a-2)