請用1, 2, 3, 7, 9 五組數字以及基本算術符號(即加減乘除和括號)列出答案為80 的算式，每組數字限用一次，且要符合四則運算的規則。
求eq(1,2,3,7,9)=80的算式
2011-09-21 10:06 pm
回答 (5)
2011-09-21 10:10 pm
✔ 最佳答案
(1 x 2 + 3) x (7 + 9) = 80 2011-09-21 18:20:23 補充：
2 x (1 + 9) x (7 - 3) = 80
(7 + 1) × (9 + 3 - 2) = 80
2011-09-22 4:59 am
(1 x 2 + 3) x (7 + 9) = 80
2 x (1 + 9) x (7 - 3) = 80
(7 + 1) × (9 + 3 - 2) = 80
2 x (1 + 9) x (7 - 3) = 80
(7 + 1) × (9 + 3 - 2) = 80
參考: Tracy
2011-09-22 2:49 am
Can the answer be this ?
73 + ( 9 - 2 ) × 1 = 80
71 + 9 × ( 3 - 2 ) = 80
79 + 3 - 2 × 1 = 80
2011-09-21 18:50:31 補充：
91 - 7 × 2 + 3 = 80
93 - 7 × 2 + 1 = 80
73 + ( 9 - 2 ) × 1 = 80
71 + 9 × ( 3 - 2 ) = 80
79 + 3 - 2 × 1 = 80
2011-09-21 18:50:31 補充：
91 - 7 × 2 + 3 = 80
93 - 7 × 2 + 1 = 80
2011-09-22 12:53 am
(1+7)x(9+3-2)=80
2011-09-22 12:05 am
(1+7) × (3 - 2 + 9) = 80
收錄日期: 2021-04-13 18:15:17
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110921000051KK00306