My friend,the third is less the first,and can't only use linear

来源: jinjing 于 2010-04-15 11:53:26 [] [旧帖] [给我悄悄话] 阅读数 : (35 bytes)
回答: Boy Meets Girl 由 commentate 于 2010-04-13 18:10:10

opration, as intg of xdx=1/2x^2.

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