Răspuns:
Explicație pas cu pas:
18 - [(7 × m + 8) : 4 - 2] : 5 + 12 × 12 = 155
18 - [(7 × m + 8) : 4 - 2] : 5 + 144 = 155
18 - [(7 × m + 8) : 4 - 2] : 5 = 155 - 144
18 - [(7 × m + 8) : 4 - 2] : 5 = 11
[(7 × m + 8) : 4 - 2] : 5 = 18 - 11
[(7 × m + 8) : 4 - 2] : 5 = 7
(7 × m + 8) : 4 - 2 = 7 × 5
(7 × m + 8) : 4 - 2 = 35
(7 × m + 8) : 4 = 35 + 2
(7 × m + 8) : 4 = 37
7 × m + 8 = 37 × 4
7 × m + 8 = 148
7 × m = 148 - 8
7 × m = 140
m = 140 ÷ 7
m = 20
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