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Sumar y restar números acabados en 1 o 9
Contributed by: Alonso
11 + 21
95 - 61
68 - 31
14 + 49
2 + 59
11 + 81
53 - 49
69 - 59
91 - 79
50 - 39
76 - 41
87 - 79
15 + 29
35 - 19
16 + 79
22 + 39
51 + 41
93 - 89
12 + 81
40 + 21
2 + 59
84 - 61
50 + 11
43 + 39
94 - 51
78 - 31
41 + 41
86 - 39
27 + 39
28 + 39
99 - 21
16 + 71
27 + 49
86 - 31
54 + 31
76 - 59
90 - 79
85 - 79
1 + 79
94 - 71
98 - 69
86 - 49
52 + 41
92 - 81
42 + 51
23 + 21
12 + 51
77 - 41
14 + 59
69 + 29
97 - 71
62 + 11
78 - 69
85 - 41
64 - 49
81 - 51
55 + 41
22 + 19
17 + 49
17 + 51
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