Odpowiedź:
a)
2x - 5 = 7
2x = 7 + 5 = 12
x = 12/2 = 6
Sprawdzenie :
2 * 6 - 5 = 7
12 - 5 = 7
7 = 7
L = P
b)
3x - 7 = 20
3x = 20 + 7 = 27
x = 27/3 = 9
3 * 9 - 7 = 20
27 - 7 = 20
20 = 20
c)
- 4x + 5 = 17
- 4x = 17 - 5 = 12
4x = - 12
x = - 12/4 = - 3
- 4 * ( - 3) + 5 = 17
12 + 5 = 17
17 = 17
d)
- 9x + 15 = - 8
- 9x = - 8 - 15
- 9x = - 23
9x = 23
x = 23/9 = 2 5/9
- 9 * 23/9 + 15 = - 8
- 23 + 15 = - 8
- 8 = - 8
e)
12x - 10 = 4
12x = 4 + 10 = 14
x = 14/12 = 1 2/12 = 1 1/6
12 * 14/12 - 10 = 4
14 - 10 = 4
4 = 4
f)
5 - 2x = 8
- 2x = 8 - 5 = 3
2x = - 3
x = - 3/2 = - 1 1/2
5 - 2 * (- 3/2) = 8
5 + 3 = 8
8 = 8
g)
17 = - 22x + 17
22x = 17 - 17 = 0
x = 0
17 = - 22 * 0 + 17
17 = 0 + 17
h)
2√3 + √3x = 4√3
√3x = 4√3 - 2√3 = 2√3
x = 2√3/√3 = 2
2√3 + √3 * 2 = 4√3
2√3 + 2√3 = 4√3
4√3 = 4√3
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Odpowiedź:
a)
2x - 5 = 7
2x = 7 + 5 = 12
x = 12/2 = 6
Sprawdzenie :
2 * 6 - 5 = 7
12 - 5 = 7
7 = 7
L = P
b)
3x - 7 = 20
3x = 20 + 7 = 27
x = 27/3 = 9
Sprawdzenie :
3 * 9 - 7 = 20
27 - 7 = 20
20 = 20
L = P
c)
- 4x + 5 = 17
- 4x = 17 - 5 = 12
4x = - 12
x = - 12/4 = - 3
Sprawdzenie :
- 4 * ( - 3) + 5 = 17
12 + 5 = 17
17 = 17
L = P
d)
- 9x + 15 = - 8
- 9x = - 8 - 15
- 9x = - 23
9x = 23
x = 23/9 = 2 5/9
Sprawdzenie :
- 9 * 23/9 + 15 = - 8
- 23 + 15 = - 8
- 8 = - 8
L = P
e)
12x - 10 = 4
12x = 4 + 10 = 14
x = 14/12 = 1 2/12 = 1 1/6
Sprawdzenie :
12 * 14/12 - 10 = 4
14 - 10 = 4
4 = 4
L = P
f)
5 - 2x = 8
- 2x = 8 - 5 = 3
2x = - 3
x = - 3/2 = - 1 1/2
Sprawdzenie :
5 - 2 * (- 3/2) = 8
5 + 3 = 8
8 = 8
L = P
g)
17 = - 22x + 17
22x = 17 - 17 = 0
x = 0
Sprawdzenie :
17 = - 22 * 0 + 17
17 = 0 + 17
17 = 17
L = P
h)
2√3 + √3x = 4√3
√3x = 4√3 - 2√3 = 2√3
x = 2√3/√3 = 2
Sprawdzenie :
2√3 + √3 * 2 = 4√3
2√3 + 2√3 = 4√3
4√3 = 4√3
L = P