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7-2 小6 數學應用題

Dec 26th 2013, 05:04

檢驗是否11的倍數是比較奇位數的數字和與偶位數的數字和，
若差是零或是11的倍數，則此數是11的倍數。
現此數是 7A4A5，奇位數之和是 (7+4+5)，即 16，
偶位數之和是 (A+A)，即 2A，若差是零，則
2A = 16
A = 8
所以此數是 78485，即 '口' 是 8。

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