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标题: gwd-21-4 谁帮忙翻译一下?顺便解一下 [打印本页]

作者: 智者多能 时间: 2006-9-30 12:47 标题: gwd-21-4 谁帮忙翻译一下?顺便解一下

A total of 20 amounts are entered on a spreadsheet that has 5 rows and 4 columns; each of the 20 positions in the spreadsheet contains one amount. The average (arithmetic mean) of the amounts in row i is R_i (1 ≤ i ≤ 5). The average of the amounts in column j is C_j (1 ≤ j ≤ 4). What is the average of all 20 amounts on the spreadsheet?

(1) R₁ + R₂ + R₃ + R₄ + R₅ = 550

(2) C₁ + C₂ + C₃ + C₄ = 440

作者: wujie_rens 时间: 2006-10-1 19:13

up!!

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