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應該是這樣的 (2a+3b)(2/a+3/b) =4+6a/b+6b/a+9 =13+6(a/b+b/a) 因a>0,b>0 故a/b+b/a≥2當且僅當a/b=b/a即a=b時等號成立 由於2a+3b=6 故當a=b=1.2時(2a+3b)(2/a+3/b)有最小值13+6*2=25 故當a=b=1.2時2/a+3/b有最小值25/(2a+3b)=25/6
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