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24点2789

1. [2*9+7]-8 2. [9+7*2]-8 3. [2*7+9]-8

2,7,8,9的24点答案:1:(2 * (7 + 9)) - 82:2 * (7 + 9) - 83:(2 * (9 + 7)) - 84:2 * (9 + 7) - 85:(7 + 9) * 2 - 86:((7 + 9) * 2) - 87:(9 + 7) * 2 - 88:((9 + 7) * 2) - 8

2*(7+9)-8=24

展开全部(2*(9+7))-8=24(2*(7+9))-8=24((9+7)*2)-8=24((7+9)*2)-8=24

1: (2 * (7 + 9)) - 82: 2 * (7 + 9) - 83: (2 * (9 + 7)) - 84: 2 * (9 + 7) - 85: (7 + 9) * 2 - 86: ((7 + 9) * 2) - 87: (9 + 7) * 2 - 88: ((9 + 7) * 2) - 8

共有2种方法!(7+9)*2-8=24(9+7)*2-8=24

2*(9+7)-8=24(7+8-9-2)!=4!=242*[8+√(9+7)]=24

2789怎么算成241: (2 * (7 + 9)) - 82: 2 * (7 + 9) - 83: (2 * (9 + 7)) - 84: 2 * (9 + 7) - 85: (7 + 9) * 2 - 86: ((7 + 9) * 2) - 87: (9 + 7) * 2 - 88: ((9 + 7) * 2) - 8

[2 * (7 + 9)] - 8

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