Răspuns:
Explicație pas cu pas:
94 + x = 100 ; y : 17 = 6
x = 100-94 => x = 6
y = 6 ·17 => y = 102
A = 43 + 3x + 3y =>
A = 43+3·6+3·102
A = 43+18+306
A = 367
56-28:(x+2) = 54 => 56-54 = 28:(x+2) =>2 = 28:(x+2) =>
2·(x+2) = 28 => x+2 = 14 => x = 14-2 => x = 12
(38+y)·3 = 168 => 114 + 3y = 168 => 3y = 168-114 =>
3y = 54 => y = 54:3 => y = 18
B = [152-5·(x+y)] = [152-5·(12+18)] = 152-5·30 = 152-150 =>
B = 2
28·(x+235) = 6860 => x + 235 = 6860:28 =>
x+235 = 245 => x = 245-235 => x = 10
y-37 = 13 => y = 37+13 => y = 50
C = 300-(5y-3x) = 300-(5·50-3·10) = 300-(250-30)
C = 300-220 =>
C = 80
