用2，3，5，9四个数怎样合理利用运算符号计算出24点算式
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1: (5 - 2) × 9 - 3
2: ((5 - 2) × 9) - 3
3: (5 × 9 + 3) ÷ 2
4: ((5 × 9) + 3) ÷ 2
5: 2 - 5 + 3 × 9
6: (2 - 5) + 3 × 9
7: 2 - 5 +(3 × 9)
8: (2 - 5) + (3 × 9)
9: 2 - (5 - 3 × 9)
10: 2 - (5 - (3 × 9))
11: 2 - 5 + 9 × 3
12: (2 - 5) + 9 × 3
13: 2 - 5 +(9 × 3)
14: (2 - 5) + (9 × 3)
15: 2 - (5 - 9 × 3)
16: 2 - (5 - (9 × 3))
17: 2 + 3 × 9 - 5
18: (2 + 3 × 9) - 5
19: (2 + (3 × 9)) - 5
20: 2 + (3 × 9) - 5
2: ((5 - 2) × 9) - 3
3: (5 × 9 + 3) ÷ 2
4: ((5 × 9) + 3) ÷ 2
5: 2 - 5 + 3 × 9
6: (2 - 5) + 3 × 9
7: 2 - 5 +(3 × 9)
8: (2 - 5) + (3 × 9)
9: 2 - (5 - 3 × 9)
10: 2 - (5 - (3 × 9))
11: 2 - 5 + 9 × 3
12: (2 - 5) + 9 × 3
13: 2 - 5 +(9 × 3)
14: (2 - 5) + (9 × 3)
15: 2 - (5 - 9 × 3)
16: 2 - (5 - (9 × 3))
17: 2 + 3 × 9 - 5
18: (2 + 3 × 9) - 5
19: (2 + (3 × 9)) - 5
20: 2 + (3 × 9) - 5
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