Răspuns :
36 × a = 72 a × 11 = 99 7 × a = 231 a × 42 = 126
a = 72 : 36 a = 99 : 11 a = 231 : 7 a = 136 : 42
a = 2 a = 9 a = 33 a = 3
a : 6 = 55 273 : a = 3 86 : a = 2 a: 9 = 21
a = 55 × 6 a = 273 : 3 a = 86 : 2 a = 21 × 9
a = 330 a = 91 a = 43 a = 189
455 : a = 5 568 : a = 8 a : 12 = 4 a : 12 = 12
a = 455 : 5 a = 568 : 8 a = 4 × 12 a = 12 × 12
a = 91 a = 71 a = 48 a = 144
a = 72 : 36 a = 99 : 11 a = 231 : 7 a = 136 : 42
a = 2 a = 9 a = 33 a = 3
a : 6 = 55 273 : a = 3 86 : a = 2 a: 9 = 21
a = 55 × 6 a = 273 : 3 a = 86 : 2 a = 21 × 9
a = 330 a = 91 a = 43 a = 189
455 : a = 5 568 : a = 8 a : 12 = 4 a : 12 = 12
a = 455 : 5 a = 568 : 8 a = 4 × 12 a = 12 × 12
a = 91 a = 71 a = 48 a = 144