Odpowiedź:
zadanie 18
a)
17 + x = 48
x= 48 - 17
x= 31
b)
7y= 42
y = 42 : 7
y = 6
c)
z - 29 = 31
z= 31 + 29
x= 60
d)
w : 8 = 40
w = 40 * 8
w = 320
zadanie 19
10 + 2x = 48
2x = 48 - 10
2x= 38
x= 38 : 2 = 19
5x - 6 = 24
5x = 24 + 6
5x = 30
x = 30 : 5 = 6
3x - 14 = 31
3x= 31 + 14
3x= 45
x= 45 : 3 = 15
6x + 12 = 114
6x = 114 - 12
6x = 102
x = 102 : 6 = 17
e)
x : 2 + 1 = 11
x : 2 = 11 - 1
x : 2 = 10
x = 10 : 2 = 20
f)
x : 5 - 4 = 16
x : 5 = 16 + 4
x : 5 = 20
x= 20 * 5 = 100
Szczegółowe wyjaśnienie:
