Odpowiedzi

2010-03-03T18:36:14+01:00
Zadania A
2x=7
x=3,5

x+8=19
x=19-8
x=11

x-7=13
x=13+7
x=20

3x+5=12
3x=12-5
3x=7
x=7/3
x=2⅓

4x-3=9x+5
-3-5=9x-4x
-8=5x
x=-8/5
x=-1,6

3(x+6)-2x=2(x+9)
3x+18-2x=2x+18
x+18=2x+18
x=0

zadania B
3x=13
x=13/3
x=4⅓

x+10=21
x=21-10
x=11

x-14=20
x=20+14
x=34

4x+8=16
4x=16-8
4x=8
x=8/4
x=2

3x-4=10x+2
-4-2=10x-3x
-6=7x
x=-6/7

(x-7)-2(3x+5)=3
x-7-6x-10=3
-5x-17=3
-5x=3+17
-5x=20
x=20/-5
x=-4
2010-03-03T18:36:43+01:00
Pisze po kolei rozwiazania:

kreska "/" oznacza ułamek :)

A.
1. x = 7/2

2. x = 19-8
x =11

3. x = 13+7
x= 20

4. 3x = 12-5
3x=7
x = 7/3

5 ,. 3x+18 - 2 x = 2x + 18
3 x - 2x -2x= 0
- x = 0
x = 0

6. 4x - 9x = 5 + 3
- 5x = 8
x = - 8/5

B .
1. x = 13/3

2. x = 21 - 10
x = 11

3. x = 20 + 14
x = 34

4. 4 x = 16- 8
4 x = 8
x = 2

5. 3x-10x = 2+4
- 7x = 6
x = - 6/7

6 . x - 7 - 6x - 10 = 3
- 5x = 20
x = - 4