5*4=20
50十49一48一47十46十45一44一43+42+41-40-39+38+37-36-35+34+33-32-31
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相关问题
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求中位数和众数:37,42,43,43,45,40,36,39,43,42,45,46,44,32,36,39,38,4
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36+37+38+39+40+41+42+43+44(简便运算)
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一个样本含有20个数据:35,31,33,35,37,39,35,38,40,39,36,34,35,37,36,32,