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2010-03-21T21:03:42+01:00
1. 2(3x+4)=3(4x-5)
6x+8= 12x-15
6x-12x= -15-8
-6x= -23|:(-6)
x=3,83
2. 3x-6=x+8
3x-x=8+6
2x=14|:2
x=7
3.1/2x+2/3= 1/3x+3/4 |* 12
6x+ 8= 4x+9
6x-4x=9-8
2x=1|:2
x=1/2

4. 6(2x+3)+2(3x-7)=4(3x-3)

12x+18+6x-14= 12x-12
12x+6x-12x= -12 -18+14
6x= -16|:6
x= -2,7

5. 4x-13=2x+15
4x-2x=15+13
2x=28|:2
x=14

6. 12x-7>3x+8
12x-3x>8+7
9x> 15|:9
x> 1,7
7. 5(2x-3)<2(3x+4)
10x -15 < 6x +8
10x-6x<8+15
4x< 23|:4
x< 5,75
8. ¼(2x+3)≤⅗(x-7)
⅗?????
9. 4x-8≥2x+10
4x -2x ≥ 10 +8
2x≥ 18|:2
x ≥ 9

10. 17x+15<13x-19
17x-13x< -19 -15
4x< -34 |:4
x= -8,5



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