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Zad.1
a)
x – ½ = 2x + 1 / * 2
2x -1 = 4x + 2
2x -4x = 2 +1
-2x = 3 /: (-2)
X =-3/2
c)
3 – x = 2x + 6
-x -2x = 6 -3
-3x = 3 /: (-3)
x = -1
e)
¼ x +2 = -4 + 1 ¼ x
¼ x +2 = -4 + 5/4 x /*4
x + 8 = -16 + 5x
x -5x = -16 -8
-4x = -24 / : (-4)
x = 6
g)
3x = -15 /: 3
x = -5
zad.4
a)
5x(x-2) – x(5x-2) = -4
5x² - 10x – 5x² + 2x = -4
-8x = -4 / : (-8)
x = 4/8
x = ½
c)
x(2-x) + (x+2)(x-2) =2
2x - x² + x² -2x +2x – 4 = 2
2x = 2+4
2x = 6 /: 2
x = 3
zad.5
a)
2x/3 + 5x/2 = 19 /*6
4x + 15x =114
19x = 114 /: 19
x =6
b)
4x/9 – 5x/12 = 1 /*36
16x – 15x = 36
x = 36
c)
3x/2 + x/6 – 2x/9 = 13 /* 36
54x + 6x -8x = 468
52x = 468 /: 52
x = 9
d)
(x-3)/3 = 4 /*3
x-3 =12
x=12 +3
x = 15
zad.7
a)
2(x+2) – 3(x-1) +8=3x -1
2x + 4 -3x + 3 + 8 = 3x -1
2x -3x -3x = -1 -4 -3 -8
-4x = -16 /: (-4)
x = 4
b)
4x – 3(x+7) – 5x + 2(x-1) = 9
4x – 3x – 7 - 5x + 2x -2 = 9
4x -3x -5x + 2x = 9 +7 +2
-2x = 18 /: (-2)
x = - 9