Using digits 1, 3, 9, 27 and symbols + or -, nosotros tin croak xl inwards the next way
1 = 1
2= 3-1
3=3
4= 3+1
5= 9- (3+1)
6 = ix – 3
7 = 9+1-3
8 = 9-1
9=9
10= 9+1
11= 9+3-1
12= 9+3
13= 9+3+1
14= 27 – (9+3+1)
15= 27- (9+3)
16= 27+1-(9+3)
17= 27- (9+1)
18= 27-9
19= 27+1-9
20= 27+3- (9+1)
21= 27+3- 9
22= 27+1+3-9
23= 27- (3+1)
24= 27-3
25= 27+1-3
26= 27-1
27= 27
28=27+1
29= 27+3-1
30= 27+3
31= 27+3+1
32= 27+9- (3+1)
33= 27+9-3
34= 27+9+1- 3
35= 27+9-1
36= 27+9
37= 27+9+1
38= 27+9+3-1
39= 3+9+27
40= 1+3+9+27
