Odpowiedzi

2010-01-07T22:19:10+01:00
A)
2x-5=3x +4 | -2x
-5 = x + 4 |-4
x = -9
b)
4x-9=x+12 |-x
3x -9 = 12 | +9
3x = 21 |:3
x = 7
c)
5x-12=3x+4 |-3x
2x - 12 = 4 | +12
2x = 16 | :2
x = 8

d)
6x-18=2x+2 | -2x
4x - 18 = 2 | +18
4x = 20 | :4
x = 5

zadanie 2

a)
5x-12=4+4x | -4x
x - 12 = 4 |+12
x = 16
b)
9x-8=3x+2 | -3x
6x - 8 = 2 |+8
6x = 10 | :6
x = 10/6 = 1 4/6 = 1 2/3
c)
10x-4=5x+8 | -5x
5x - 4 = 8 | +4
5x = 12 | :5
x = 12/5 = 2 2/5
d)
2x-2=-12x+18 | +12x
14x -2 = 18 | +2
14x = 20 |: 14
x = 20/14 = 1 6/14 = 1 3/7
2010-01-07T22:19:14+01:00
1.
a) -x=9| : (-1)
x=-9
b)3x=21 | : 3
x=7
c)2x=16 | : 2
x=8
d)4x=20 | : 4
x=5

2.
a) x=16
b)6x=10 | : 6
x=1,66
c)5x=12 | : 5
x=2,4
d)14x=20 | : 14
x=1,428 w przyblizeniu 1,43
1 5 1
2010-01-07T22:21:05+01:00
Zadanie 1.

a) 2x-5=3x
2x-3x=5
-x=5|*(-1)
x=-5

b)4x-9=x+12
4x-x=12+9
3x=21|:3
x=7

c)5x-12=3x+4
5x-3x=4+12
2x=16|:2
x=8

d)6x-18=2x+2
6x-2x=20
4x=20|:4
x=5

Zadanie 2 .

a)5x-12=4+4x
5x-4x=4+12
x=16

b)9x-8=3x+2
9x-3x=2+8
6x=10|:6
x=1 2/3

c)10x-4=5x+8
10x-5x=8+4
5x=12|:5
x=2 2/5

d)2x-2=-12x+18
2x+12x=18+2
14x=20|:14
x=1 3/7