作业帮2 5 7 9怎么等于24
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2 5 7 9怎么等于24
2 5 7 9怎么等于24
2 5 7 9怎么等于24
1:5 × 7 -(2 + 9)
2:(5 × 7) - (2 + 9)
3:5 × 7 - 2 - 9
4:(5 × 7) - 2 - 9
5:(5 × 7 - 2) - 9
6:((5 × 7) - 2) - 9
7:5 × 7 -(9 + 2)
8:(5 × 7) - (9 + 2)
9:5 × 7 - 9 - 2
10:(5 × 7) - 9 - 2
11:(5 × 7 - 9) - 2
12:((5 × 7) - 9) - 2
13:7 × 5 -(2 + 9)
14:(7 × 5) - (2 + 9)
15:7 × 5 - 2 - 9
16:(7 × 5) - 2 - 9
17:(7 × 5 - 2) - 9
18:((7 × 5) - 2) - 9
19:7 × 5 -(9 + 2)
20:(7 × 5) - (9 + 2)
21:7 × 5 - 9 - 2
22:(7 × 5) - 9 - 2
23:(7 × 5 - 9) - 2
24:((7 × 5) - 9) - 2
（12/2-4）*12 (7 8)乘以8再除以5 (7 1-2)乘以4 (11-5):(7-2 1)*4=6*4=24; 5 9 11 13:(11-5)*(13-9)=6*4=24;
5X7—2—9=24