Odpowiedź :
Odpowiedź:
a) 4 • x - 3 + 5 • x = 15
4 • x + 5 • x = 15 + 3
9 • x = 18 /: 9
x = 2
Spr : 4 • 2 - 3 + 5 • 2 = 8 - 3 + 10 = 5 + 10 = 15
b) 5 • x + 7 - 3 •x = 13
5 • x - 3 • x = 13 - 7
2 • x = 6 /: 2
x = 3
Spr : 5 • 3 + 7 - 3 • 3 = 15 + 7 - 9 = 22 - 9 = 13
c) 7 • x - 2 - 6 • x = 5
7 • x - 6 • x = 5 + 2
1 • x = 7 /: 1
x = 7
Spr : 7 • 7 - 2 - 6 • 7 = 49 - 2 - 42 = 47 - 42 = 5
d) 6 • x - 4 + 4 • x = 56
6 • x + 4 • x = 56 + 4
10 • x = 60 /: 10
x = 6
Spr : 6 • 6 - 4 + 4 • 6 = 36 - 4 + 24 = 32 + 24 = 56
e) 2 • x - 3 + x = 9
2 • x + x = 9 + 3
3 • x = 12 /: 3
x = 4
Spr : 2 • 4 - 3 + 4 = 8 - 3 + 4 = 5 + 4 = 9
Pozdrawiam.