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hank612

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2Â¥: Originally posted by feixiaolin at 2015-04-04 17:44:39
1. ¿¼ÂǶ˵㡢¼«ÖµµãµÄÕý¸ºÐÔÖÊ£»
2. (a+b+c|>=3*pow(a*b*c, 1/3)¹«Ê½£¿

°æÖ÷´óÉñÆäʵ¸æËßÎÒÃÇ, Ϊʲô |sin^2(x)sin(2x)|×î´óÖµÔÚ´¦È¡µ½.

Èç¹û1>t>0, ÒòΪ  [/latex]\frac{t}{3}+\frac{t}{3}+\frac{t}{3}+(1-t)=1[/latex] Ϊ³£Êý, ÓɰæÖ÷ÌṩµÄ²»µÈʽ, ×î´óÖµÔÚ t/3=1-t, ¼´t=3/4´¦È¡µ½. Òò´Ë, ×î´óÖµÔÚsin^2(x)=3/4´¦È¡µ½, ËùÒÔxÔÚ[0,2Pi]ÉÏÓÐËÄ´¦È¡µ½.
We_must_know. We_will_know.
11Â¥2015-04-09 05:07:54
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