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October 31, 2011
青春猛回頭 2011-10-31 誰說資優生無所不能? 他們也會有罩門!
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October 31, 2011
sin(alph+beta)明明就等于sin（alpha）cos(beta) + cos (alpha) sin(beta), 不是相乘。。。
the math question on the sweets: is 21 right?
that question about sweet is a bit odd，5/3=1.3333 suggest that there is no sufficient paper to get 2 sweets, as if you use the remaining 5 papers to get sweet, you can only get 1. so it should be 15+5+1=21.