數學高手!! 難題!!!
回答 (1)
2011-08-26 11:32 am
✔ 最佳答案
(173+162)/2±7.5做bracket先, 先乘除, 後加減這題有兩個答案, 因為 ±7.5 (173+162)/2+7.5335/2+7.5167.5 + 7.5 = 175 (173+162)/2-7.5335/2-7.5167.5 - 7.5 = 160 (173+162)/2±7.5 = 175 or 160
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