在1,2,3,4,5,......1994这1994个数中选出一下数,使得这些数
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![在1,2,3,4,5,......1994这1994个数中选出一下数,使得这些数](/uploads/image/f/3184417-1-7.jpg?t=%E5%9C%A81%2C2%2C3%2C4%2C5%2C......1994%E8%BF%991994%E4%B8%AA%E6%95%B0%E4%B8%AD%E9%80%89%E5%87%BA%E4%B8%80%E4%B8%8B%E6%95%B0%2C%E4%BD%BF%E5%BE%97%E8%BF%99%E4%BA%9B%E6%95%B0)
木炭在氧气中燃烧,发出白光,生成能使澄清石灰水变浑浊的气体(CO2)硫在氧气中燃烧,发出明亮的蓝紫色火焰,产生一种具有刺激性气味的气体红磷在空气中燃烧,产生大量的白烟,生成一种白色固体铁丝在氧气中剧烈
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9无论加还是减8都为奇数加或减7为偶数偶数加减偶数6为偶数偶数加减奇数5为奇数奇数加减偶数4为奇数奇数加减奇数3为偶数偶数加减偶数2为偶数偶数加减奇数1为奇数因为20不是奇数所以无解
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是这些数组成一个数字吗?应该是142305
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先算个位上的2:1——100,有10个(2、12、22、32、42、52、62、72、82、92),注意22中十位上2的暂时不算;所以一共10*5=50个;再算十位上的2:1——100,有10个(20
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