3a2-ab=a(3a-b),
3a2+5ab-2b2=(3a-b)(a+2b),
则
3a2-ab/3a2+5ab-2b2
=a(3a-b)/(3a-b)(a+2b)
=a/(a+2b).
化简 3a2-ab/3a2+5ab-2b2
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