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- 2质数合和数是按自然数什么来分的
- 3一列火车从甲地开往乙地每小时行50 千米,1小时后,另一列火车也丛甲地开往乙地,每小时行60千米,
- 4匀加速运动怎么求某一时间点的位移?
- 5用所给词的适当形式填空..Listen!One of the students ____ (sing) an English song.
- 6如图,在△ABC中,AD、BD分别平分∠BAC和∠ABC,延长AD交△ABC的外接圆于E,连接BE.求证:BE=DE.
- 7The right and go straight along the Bank Street.=The right,()go straight ()the Bank Street
- 8翻译一句Mary was eager to have her invitation to her birthday party accepted by Mr Hart.
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- 10已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值