(3ab-6a²)/3a

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(3ab-6a²)/3a(3ab-6a²)/3a(3ab-6a²)/3a用3a约分:(3ab-6a²)/3a=b-2a

(3ab-6a²)/3a
(3ab-6a²)/3a

(3ab-6a²)/3a
用3a约分:
(3ab-6a²)/3a
=b-2a