问题
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2/5,3/7,4/10,6/14,8/20,12/28,()A.224/56B.14/32C.20/48D.16/40
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2/5,3/7,4/10,6/14,8/20,12/28,()。 A.224/56B.14/32C.20/48D.16/40
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-56,25,-2,7,4,()A.3 B.-12 C.-24 D.5
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-56,25,-2,7,4,()A.3 B.-12 C.-24 D.5
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列竖式计算。(1)438×25=(2)79×209=(3)360×17=(4)178×64=(5)308×56=(6)65×236=
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有6个人的某项指标测量值:3.56 4.1 8 5.20 7.1 6 2.20 3.89 则标准差