Odpowiedź:
1. 4 (a - 1) = 6 (1+a) - 4a
4a - 4 = 6 + 6a - 4a
4a - 4 = 6 + 2a
2a = 10
a = 5
Sprawdzenie:
4 * (5-1) = 6 * (1+5) - 4 * 5
4 * 4 = 6 * 6 - 20
16 = 36 - 20
16 = 16
2.
(x-7) - 2(3x+5) = 3-x
x - 7 -6x - 10 = 3 - x
-5x - 17 = 3 - x
-4x = 20
x = -5
(-5-7) -2 (3*(-5) + 5) = 3 - (-5)
-12 -2 * (-15+5) = 3 + 5
-12 - 2 * (-10) = 8
-12 + 20 = 8
8 = 8
3.
4.
5.
6.
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Odpowiedź:
1. 4 (a - 1) = 6 (1+a) - 4a
4a - 4 = 6 + 6a - 4a
4a - 4 = 6 + 2a
2a = 10
a = 5
Sprawdzenie:
4 * (5-1) = 6 * (1+5) - 4 * 5
4 * 4 = 6 * 6 - 20
16 = 36 - 20
16 = 16
2.
(x-7) - 2(3x+5) = 3-x
x - 7 -6x - 10 = 3 - x
-5x - 17 = 3 - x
-4x = 20
x = -5
Sprawdzenie:
(-5-7) -2 (3*(-5) + 5) = 3 - (-5)
-12 -2 * (-15+5) = 3 + 5
-12 - 2 * (-10) = 8
-12 + 20 = 8
8 = 8
3.
4.
Sprawdzenie:
5.
6.
Sprawdzenie: