解
(4a+4b)/(5ab)×(35a²b)/(a²-b²)——这个吧
=4(a+b)/(5ab)×(5ab)(7a)/(a-b)(a+b)
=(4×7a)/(a-b)
=28a/(a-b)
4a+4b/5ab*35a^2b/a^2-b^2
1个回答
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