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yizhuxuan000: ½ð±Ò+20, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2016-12-06 21:55:32
¡Ò_0^b▒¦Ñdx/(2¦Å_0 )=¡Ò_0^b▒kx/(2¦Å_0 ) dx=(kb^2)/(4¦Å_0 )
4Â¥2016-12-06 15:14:50
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