1个9,1个5,1个4,1个2加减乘除怎么计算等于24
问题描述：
1个9,1个5,1个4,1个2加减乘除怎么计算等于24
答
1:(9 - 5) × (4 + 2)2:(9 + 5) × 2 - 43:((9 + 5) × 2) - 44:(9 - 5 + 2) × 45:((9 - 5) + 2) × 46:(9 - (5 - 2)) × 47:(9 - 5) × (2 + 4)8:(9 + 2 - 5) × 49:((9 + 2) - 5) × 410:(9 + (2 - 5)) × 411:(5...