Question

. rozwiąż równania.
1. 2x-3/4=1/2+x
2. x+2/9+x-1/3=1
3. 2x+3/5=2-x/3+x
4. 3x-5/2-5x-1/10=0
5. x/2=2/5(4-x)-4
6. 2x-1/5-x-2/2=0,7x
7. 2x-3x+5/4=-1/4x-1
8. -2(2x-1)=x/3
9. 2/5(3-x)=-2
10. 3/4(2-3x)=-6
11. 1/5(x-3)=9-x
12. 0,6+x/2=x+1
za dobre odpowiedzi daje naj plis potszebne na zaras :)

Answer 1

1. 2x-3/4=1/2+x     /*4
8x - 3 = 2 + 4x
8x - 4x = 2 + 3
4x = 5     /:4
x = 1,25

2. x+2/9+x-1/3=1    /*9
9x + 2 + 9x - 3 = 9
9x + 9x = 9 + 3 - 2
18x = 10     /:18
x = 5/9

3. 2x+3/5=2-x/3+x    /*15
30x + 9 = 30 - 5x + 15x
30x + 5x - 15x = 30 - 9
20x = 21   /:20
x = 1,05

4. 3x-5/2-5x-1/10=0     /*10
30x - 25 - 50x - 1 = 0
30x - 50x = 1 + 25
-20x = 26     /:(-20)
x = -1,3

5. x/2=2/5(4-x)-4
x/2 = 8/5 - 2x/5 - 4     /*10
5x = 16 - 4x - 40
5x + 4x = 16 - 40
9x = -24   /:9
x = -8/3

6. 2x-1/5-x-2/2=0,7x    /*10
20x - 2 - 10x - 10 = 7x
20x - 10x -7x = 10 + 2
3x = 12    /:3
x = 4

7. 2x-3x+5/4=-1/4x-1    /*4
8x - 12x + 5 = -x - 4
8x - 12x +x  =  -4 - 5
-3x = -9     /:(-3)
x = 3

8. -2(2x-1)=x/3
-4x + 2 = x/3    /*3
-12x + 6 = x
-12x - x = -6
-13x = -6    /:(-13)
x = 6/13

9. 2/5(3-x)=-2
6/5 - 2x/5 = -2   /*5
6 - 2x = -10
-2x = -10 - 6
-2x = -16    /:(-2)
x = 8

10. 3/4(2-3x)=-6
6/4 - 9x/4 = -6    /*4
6 - 9x = -24
-9x = -24 - 6
-9x = -30    /:(-9)
x = 10/3

11. 1/5(x-3)=9-x
x/5 - 3/5 = 9 - x    /*5
x - 3 = 45 - 5x
x + 5x = 45 + 3
6x = 48    /:6
x = 8

12. 0,6+x/2=x+1    /*2
1,2 + x = 2x + 2
x - 2x = 2 - 1,2
-x = 0,8    /:(-1)
x = -0,8