计算:
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=
.
考点分析:
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在大课间活动中,体育老师对甲、乙两名同学每人进行10次立定跳远测试,他们的平均成绩相同,方差分别是
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,
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人体内某种细胞可近似地看作球体,它的直径为0.000 000 156m,将0.000 000 156用科学记数法表示为
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D.
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D.
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