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他离开帐篷, 开始走入森林。 He ________ the tent and ________ ________ ________ into the forest.
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How many ____ can you see? A. triangle B. triangles C. a triangle
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When I was young, I was always frustrated ( 挫败的 ), and almost everything ended in failure.
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已知数列an满足a1=4 an=4-4/an-1(n大于等于2) 求证bn是等差数列 求数列an的通项公式
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