Odpowiedź:
120.
a)
(x + 1)/3 = 7 /*3
x + 1 = 21
x = 21 - 1 = 20
b)
(3 - x)/2 = 1/3 /*2
3 - x = 2/3
-x = 2/3 - 3 /*(-1)
x = 2 1/3
c)
1 - 3x = 1/2
-3x = 1/2 - 1 /:(-3)
x = (1 - 1/2)/3 = 1/2 * 1/3 = 1/6
221
a)
2x - 5 - x - 3 = 8
x - 8 = 8
x = 8 + 8 = 16
b)
6 - x - x/2 = 4
-1 1/2x = 4 - 6
-3/2x = -2 /*(-2/3)
x = 2 * 2/3 = 4/3 = 1 1/3
c)
3/4x - x - 1 = 0
-1/4x = 1 /*(-4)
x = -4
d)
1/5x + 3 = 5 - 1/2x
1/5x + 1/2x = 5 - 3
2/10x + 5/10x = 2
7/10x = 2 /*10/7
x = 2 * 10/7 = 20/7 = 2 6/7
Szczegółowe wyjaśnienie:
