a/(3a+6)-5/(a²+4a+4)
=a/[3(a+2)]-5/(a+2)²
=a(a+2)/[3(a+2)²]-5*3/[3(a+2)²]
=[a(a+2)-15]/[3(a+2)²]
=[a²+2a-15]/[3(a+2)²]
=(a+5)(a-3)/[3(a+2)²]
(a/3a+6)-(5/a²+4a+4)怎么算,
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