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  【(3a-6b)/(a+b)-(5a-6b)/(a-b)-(4a-5b)/(a+b)-(7a-8b)/(a-b)快】

  (3a-6b)/(a+b)-(5a-6b)/(a-b)-(4a-5b)/(a+b)-(7a-8b)/(a-b)

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2020-03-2501:24
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宁爱军

  (3a-6b)/(a+b)-(5a-6b)/(a-b)-(4a-5b)/(a+b)-(7a-8b)/(a-b)=(3a-6b)/(a+b)-(4a-5b)/(a+b)-(5a-6b)/(a-b)-(7a-8b)/(a-b)=(3a-6b-4a+5b)/(a+b)-(5a-6b+7a-8b)/(a-b)=-(a+b)/(a+b)-(12a-14b)/(a-b)=-1...

2020-03-25 01:25:18
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