24点游戏 15
24点游戏：红色扑克牌代表负数，黑色扑克牌代表正数，对于下面一组牌（2，4，7，-11），列算式...
24点游戏：红色扑克牌代表负数，黑色扑克牌代表正数，对于下面一组牌（2，4，7，-11），列算式
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2*{[4平方+（-11）]+7}
如果不用平方，则此题无解
如果不用平方，则此题无解
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285: (11 + (7 + 4)) + 2
286: 11 + (7 + 4) + 2
287: 11 + (7 + 4 + 2)
288: 11 + ((7 + 4) + 2)
289: 11 + (7 + (4 + 2))
290: 11 + 7 +(4 + 2)
291: (11 + 7) + (4 + 2)
292: (11 - 7) × (4 + 2)
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11 + (7 + 4 + 2)
11 + ((7 + 4) + 2)
11 + (7 + (4 + 2))
11 + 7 +(4 + 2)
(11 + 7) + (4 + 2)
11 + ((7 + 4) + 2)
11 + (7 + (4 + 2))
11 + 7 +(4 + 2)
(11 + 7) + (4 + 2)
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2*{[4平方+（-11）]+7}
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