Odpowiedź:
1) x - 9 = 16
x = 16 + 9
x = 25
Spr. : L = x - 9 = 25 - 9 = 16
P = 16
L = P
2) x + 7 = 12
x = 12 - 7
x = 5
Spr. : L = x + 7 = 5 + 7 = 12
P = 12
L = P
3) 6 + x = 15
x = 15 - 6
x = 9
Spr. : L = 6 + x = 6 + 9 = 15
P = 15
L = P
4) a - 8 = 3
a = 3 + 8
a = 11
Spr. : L = a - 8 = 11 - 8 = 3
P = 3
L = P
5) y + 4 = 11
y = 11 - 4
y = 7
Spr. : L = y + 4 = 7 + 4 = 11
P = 11
L = P
6) y - 5 = 9
y = 9 + 5
y = 14
Spr. : L = y - 5 = 14 - 5 = 9
P = 9
L = P
7) 8 + x = 25
x = 25 - 8
x = 17
Spr. : L = 8 + x = 8 + 17 = 25
P = 25
L = P
8) x - 3 = 13
x = 13 + 3
x = 16
Spr. : L = x - 3 = 16 - 3 = 13
P = 13
L = P
9) 7x = 49
7x = 49 /: 7
x = 7
Spr. : L = 7x = 7 • 7 = 49
P = 49
10) 4a = 28
4a = 28 /: 4
a = 7
Spr. : L = 4a = 4 • 7 = 28
P = 28
L = P
Pozdrawiam.
