Odpowiedź :
Odpowiedź:
a) m - 4 = 8
m = 8 + 4
m = 12
Spr. : L = m - 4 = 12 - 4 = 8
P = 8
L = P
b) x + 7 = 11
x = 11 - 7
x = 4
Spr. : L = x + 7 = 4 + 7 = 11
P = 11
L = P
c) y + 4 = 9
y = 9 - 4
y = 5
Spr. : L = y + 4 = 5 + 4 = 9
P = 9
L = P
d) m • 4 = 8
m = 8 : 4
m = 2
Spr. : L = m • 4 = 2 • 4 = 8
P = 8
L = P
e) x • 7 = 21
x = 21 : 7
x = 3
Spr. : L = x • 7 = 3 • 7 = 21
P = 21
L = P
f) 3 • f = 9
f = 9 : 3
f = 3
Spr. : L = 3 • f = 3 • 3 = 9
P = 9
L = P
g) 2 • m - 4 = 8
2 • m = 8 + 4
2 • m = 12 /: 2
m = 6
Spr. : L = 2 • m - 4 = 2 • 6 - 4 = 12 - 4 = 8
P = 8
L = P
h) 8 • x + 7 = 15
8 • x = 15 - 7
8 • x = 8 /: 8
x = 1
Spr. : L = 8 • x + 7 = 8 • 1 + 7 = 8 + 7 = 15
P = 15
L = P
i) -4 • h + 5 = 29
-4 • h = 29 - 5
-4 • h = 24 /: (-4)
h = -6
Spr. : L = -4 • h + 5 = -4 • (-6) + 5 = 24 + 5 =
= 29
P = 29
L = P
Pozdrawiam.