Question

7.1.2.5.用加减乘除组成得数是24的算式

Answer 1

1:b (7+1)*(5-2)
2:c (7+(1*5))*2
3:a ((7*1)+5)*2)
4:a ((7/1)+5)*2)
5:a ((7-2)*5)-1)
6:a ((7+5)*1)*2)
7:b (7+5)*(1*2)
8:c (7+(5*1))*2
9:a ((7+5)/1)*2)
10:c (7+(5/1))*2
11:b (7+5)/(1/2)
12:a ((7+5)*2)*1)
13:b (7+5)*(2*1)
14:a ((7+5)*2)/1)
15:b (7+5)*(2/1)
16:b (1+7)*(5-2)
17:a ((1*7)+5)*2)
18:c (1*(7+5))*2
19:d 1*((7+5)*2)
20:b (1*2)*(7+5)
21:e 1*(2*(7+5))
22:b (1*2)*(5+7)
23:e 1*(2*(5+7))
24:a ((1*5)+7)*2)
25:c (1*(5+7))*2
26:d 1*((5+7)*2)
27:e 2*(7+(1*5))
28:d 2*((7*1)+5)
29:d 2*((7/1)+5)
30:c (2*(7+5))*1
31:d 2*((7+5)*1)
32:e 2*(7+(5*1))
33:c (2*(7+5))/1
34:d 2*((7+5)/1)
35:e 2*(7+(5/1))
36:b (2*1)*(7+5)
37:d 2*((1*7)+5)
38:e 2*(1*(7+5))
39:b (2/1)*(7+5)
40:e 2/(1/(7+5))
41:b (2*1)*(5+7)
42:d 2*((1*5)+7)
43:e 2*(1*(5+7))
44:b (2/1)*(5+7)
45:e 2/(1/(5+7))
46:c (2*(5+7))*1
47:d 2*((5+7)*1)
48:e 2*(5+(7*1))
49:c (2*(5+7))/1
50:d 2*((5+7)/1)
51:e 2*(5+(7/1))
52:e 2*(5+(1*7))
53:d 2*((5*1)+7)
54:d 2*((5/1)+7)
55:a ((5+7)*1)*2)
56:b (5+7)*(1*2)
57:c (5+(7*1))*2
58:a ((5+7)/1)*2)
59:c (5+(7/1))*2
60:b (5+7)/(1/2)
61:a ((5+7)*2)*1)
62:b (5+7)*(2*1)
63:a ((5+7)*2)/1)
64:b (5+7)*(2/1)
65:c (5*(7-2))-1
66:c (5+(1*7))*2
67:a ((5*1)+7)*2)
68:a ((5/1)+7)*2)
69:b (5-2)*(7+1)
70:b (5-2)*(1+7)

Answer 2

(7+1)*(-2+5)=24
楼上顺序错了

Answer 3

（7+5）*1*2=24