Odpowiedź:
a) 3x + 10 - 2x = 4x + 1
3x - 2x - 4x = 1 - 10
-3x = - 9 |: (-3)
X = 3
b) 8 - 2x - 5 +5x = 8 +4x - 3
-2x + 5x - 4x = - 8 +5 +8 - 3
-x = 2 |: (-1)
x = - 2
C) 7x - 4 +3x +6 =9 -2x + 7 +5x
7x + 3x +2x - 5x = 4 - 6 + 9 + 7
7x = 14 |:7
x = 2
d) 1 - 4x - 5 - 5x +2 =6x - 6 - 8x - 3
-4x - 5x - 6x + 8x = - 1 +5 - 2-6-3
-7x = - 7 |: (-7)
x = 1
e) - 3x + 2 + x = 2x + 6 + 2x +2
-3x + x - 2x - 2x = - 2 +6 +2
-6x = 6 |:(-6)
x =-1
f) 4x + 7 + 5x = 6x + 12 + 2x
4x + 5x - 6x - 2x = - 7 +12
x = 5
g) 1 - 2x - 12 - 7x = 3x + 10 - 5x
-2x - 7x - 3x +5 x = - 1 + 12 +10
-7x = 21 | :(-7)
x = - 3
H) 6x + 5 +2x + x = 7x + 2 -4x + 3
6x + 2x + x - 7x + 4x = - 5 +2 +3
6x = 0 |:6
x = 0
Szczegółowe wyjaśnienie:
Sprawdzenie
a) - 3 × 3 = - 9
b) - 1 × (-2) = 2
c) 7 × 2 = 14
d) - 7 × 1 = - 7
e) - 6 × (-1) ="6
f) 5
g) - 7 × (-3) = 21
h) x = 0
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