Rozwiąż równania i wykonaj sprawdzenie a) (21 - x) : 6 = 3 48 : (7 + m) = 3 b) 5c - 17 = 13 10 - 4d = 2 C) (20 + p) • 3 = 159 7• (12 - t) = 84
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Odpowiedź:
Szczegółowe wyjaśnienie:
a)
(21 - x) : 6 = 3
(21 - x) / 6 = 3 I * 6
21 - x = 18 I - 21
-x = -3 I * (-1)
x = 3
Sprawdzenie :
(21 - 3) : 6 = 3
18 : 6 = 3
3 = 3
L = P
48 : (7 + m) = 3
48 / (7 + m) = 3 I * (7 + m) gdzie m ≠ 0
48 = 3 * (7 + m) I : 3
16 = 7 + m I - 7
9 = m
m = 9
Sprawdzenie :
48 : (7 + 9) = 3
48 : 16 = 3
3 = 3
L = P
b)
5c - 17 = 13 I + 17
5c = 30 I : 5
c = 6
Sprawdzenie :
5 * 6 - 17 = 13
30 - 17 = 13
13 = 13
L = P
10 - 4d = 2 I - 10
-4d = -8 I : (-4)
d = 2
Sprawdzenie :
10 - 4 * 2 = 2
10 - 8 = 2
2 = 2
L = P
c)
(20 + p) * 3 = 159 I : 3
20 + p = 53 I - 20
p = 33
Sprawdzenie :
(20 + 33) * 3 = 159
53 * 3 = 159
159 = 159
L = P
7 * (12 - t) = 84 I : 7
12 - t = 12 I - 12
-t = 0 I * (-1)
t = 0
Sprawdzenie :
7 * (12 - 0) = 84
7 * 12 = 84
84 = 84
L = P