Odpowiedź:
zad 3
a)
2x + 17 = 26 - x
2x + x = 26 - 17
3x = 9
x = 9/3 = 3
b)
11 - x = 3x + 8
- x - 3x = 8 - 11
- 4x = - 3
4x = 3
x = 3/4
c)
- 7(x + 2) + 4 = - 3x
- 7x - 14 + 4 = - 3x
- 7x + 3x = 14 - 4
- 4x = 10
4x = - 10
x = - 10/4 = - 2 2/4 = - 2 1/2
zad 4
a)
x/2 = 5/6
6x = 5 * 2
6x = 10
x = 10/6 = 10 4/6 = 10 2/3
b)
x/2 = (x + 1)/4
4x = 2(x + 1)
4x = 2x + 2
4x - 2x = 2
2x = 2
x = 2/2 = 1
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