yhl2454640 幼苗
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Children these days ________ their parents too much. They should learn to look after themselves.
1年前
在半径为R的圆中有一条长度为R的弦,则该弦所对的圆周角的度数是
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Sometimes I watch TV. Sometimes I read magazines. (用or把两句连成一句)
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Many men were b________ underground when the accident at the mine happened.
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若bn=2(1-n)an(n≥2),求证:b22+b32+…+bn2<1.
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