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3,-5,7,-13如何算24点,只能用加减乘除

3,-5,7,-13如何算24点,只能用加减乘除在线等,快点,谢谢1: (5 × 13 + 7) ÷ 3 2: ((5 × 13) + 7) ÷ 3 3: (7...