2. 外语
  3. In the figure above, if the sum of each column, row, and five-element diagonal is equal to x, what is the value of p+r ?

In the figure above, if the sum of each column, row, and five-element diagonal is equal to x, what is the value of p+r ?

admin2009-05-19  25
问题
In the figure above, if the sum of each column, row, and five-element diagonal is equal to x, what is the value of p+r ?
选项 A、13
B、17
C、20
D、23
E、30
答案E
解析 在图形中，若每行(row)、每列(column)以及对角线(diagonal)上的5个元素的和都为x，问p+r的值是多少?
解：本题的正确答案是(E)。根据每行每列及对角线上的数字和都相等可得：p+5+r+21+9=10+12+19+21+3→p+r=30
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