※ 引述《darkseer (进入无限期公假)》之铭言： : Source:Mathlink : Let a,b be arbitrary positive reals. Show that : 1 1 1 : ----------- + ----------- >= ------------ : 1+a+a^2+a^3 1+b+b^2+b^3 1+(ab)^(3/2) : How can an inequality with only two variables be so hard? : It costs me more than two hours... ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ It can't "cost" you more than two hours. It "took" you more than two hours. money 用 cost time 用 take 虽然我知道这不是重点 不过文法还是要注意 -- One must reap before one can sow. 想播种就得先收割。 --

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