用加减乘除把四个数组成24：7,-7,3,-3
问题描述：
用加减乘除把四个数组成24：
7,-7,3,-3
答
7 × [(-3) ÷ (-7)+3]
答
哇,正解啊,厉害
答
[(-3/-7)+3]*7
答
1: 7 × (3 ÷ 7 + 3)
2: 7 × ((3 ÷ 7) + 3)
3: 7 × (3 + 3 ÷ 7)
4: 7 × (3 + (3 ÷ 7))
5: (3 ÷ 7 + 3) × 7
6: ((3 ÷ 7) + 3) × 7
7: (3 + 3 ÷ 7) × 7
8: (3 + (3 ÷ 7)) × 7