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5,4,2,7怎么算24呀

题目详情
5,4,2,7怎么算24呀
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答案和解析
1:(4 × (5 + 7)) ÷ 2
2:4 × (5 + 7) ÷ 2
3:4 × ((5 + 7) ÷ 2)
4:(4 - 2) × (5 + 7)
5:4 ÷ 2 ×(5 + 7)
6:(4 ÷ 2) × (5 + 7)
7:4 ÷ (2 ÷ (5 + 7))
8:(4 - 2) × (7 + 5)
9:4 ÷ 2 ×(7 + 5)
10:(4 ÷ 2) × (7 + 5)
11:4 ÷ (2 ÷ (7 + 5))
12:(4 × (7 + 5)) ÷ 2
13:4 × (7 + 5) ÷ 2
14:4 × ((7 + 5) ÷ 2)
15:(5 + 7) × (4 - 2)
16:(5 + 7) × 4 ÷ 2
17:((5 + 7) × 4) ÷ 2
18:(5 + 7) × (4 ÷ 2)
19:(5 + 7) ÷ 2 × 4
20:((5 + 7) ÷ 2) × 4
21:(5 + 7) ÷ (2 ÷ 4)
22:(7 + 5) × (4 - 2)
23:(7 + 5) × 4 ÷ 2
24:((7 + 5) × 4) ÷ 2
25:(7 + 5) × (4 ÷ 2)
26:(7 + 5) ÷ 2 × 4
27:((7 + 5) ÷ 2) × 4
28:(7 + 5) ÷ (2 ÷ 4)