Răspuns:
Explicație pas cu pas:
8.
a)
8 - 12 : 6 = (8 - 3*2)*x
8 - 2 = (8 - 6)*x
6 = 2*x
x = 6 : 2 = 3
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b)
[(274 - x) : 6] : 31 = 2
(274 - x) : 6 = 31*2 = 62
274 - x = 62*6 = 372
x = 274 - 372 = -98
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c)
[48 + 42 - (x : 3 + 15)] : 3 = 128 - 104 = 24
48 + 42 - (x : 3 + 15) = 24*3 = 72
90 - (x : 3 + 15) = 72
x : 3 + 15 = 90 - 72 = 18
x : 3 = 18 - 15 = 3
x = 3*3 = 9
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9.
a)
2^x - 4 = 4
2^x = 4 + 4 = 8 = 2^3
x = 3
b)
(70^2 + x) - 401 = 5*100
4900 + x = 500 + 401 = 901
x = 4900 - 901 = 3999
