标题:解答
x/60=(20-x)/5
x=18.46153846
(MYAPPLE)修改于2008-5-15 23:07:45小荷才露尖尖角,
早有蜻蜓立上头。
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今天灿烂辉煌的阳光,
就是明天成功的梦想!
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Lu Xiao-He only pointed Kok,
Already dragonflies top legislature.
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Today, brilliant sunshine,
Tomorrow is the dream of success!