Răspuns:
Explicație pas cu pas:
1.
a + b + c = 82
b = a/3 + 2
c = 2a/3 - 4
a + a/3 + 2 + 2a/3 - 4 = 82
3a/3 + a/3 + 2a/3 = 84
6a/3 = 84
2a = 84
a = 84 : 2 = 42
b = 42/3 + 2 = 14 + 2 = 16
c = 2*42/3 - 4 = 28 - 4 = 24
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2.
75 - {6*[3 + (a + 3) : 2 - 7] - 3} *5 = 30
{6*[3 + (a + 3) : 2 - 7] - 3} *5 = 75 - 30 = 45
6*[3 + (a + 3) : 2 - 7] - 3 = 45 : 5 = 9
6*[3 + (a + 3) : 2 - 7] = 9 + 3 = 12
3 + (a + 3) : 2 - 7 = 12 : 6 = 2
(a + 3) : 2 = 2 + 7 - 3 = 6
a + 3 = 6 *2 = 12
a = 12 - 3 = 9
