Question

Proszę o rozwiązanie ;]

/ - to kreska ułamkowa

1. 4-2/5x=1/2x+2

2. 3/4x-3=1/2-3/8x

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

4. 0,8x+2=0,2x+5

5. 0,12x-1,2=0,8-0,25x

6. 3,5-0,21x=4,2+0,07x

To na jutro ;/

Answer 1

po za równaniem "/" to pionowa kreska

1.

4-2/5x=1/2x+2                /*10

40+2x=5x+2                    /-2x

40=3x+2                         /-2

38=3x                            /:3x

12 2/3=x

2.

3/4x-3=1/2-3/8x          /*8

6x-3=4-3x                    /+3x

9x-3=4                        /+3

9x=7                           /:9

x=7/9

3.

0,2x+3=0,5-0,3x        /*10

2x+30=5-3x               /+3x

5x+30=5                   /-30

5x=-25                     /:5

x=-5

4.

0,8x+2=0,2x+5         /*10

8x+20=2x+5             /-2x

6x+20=5                  /-20

6x=-15                    /:6

x=-2,5

5.

0,12x-1,2=0,8-0,25x           /*100

12x-120=80-25x                 /+25x

37x-120=80                       /+120

37x=200                           /37

x=5 25/37

6.

3,5-0,21x=4,2+0,07x         /*100

350-21x=420+7x               /+21x

350=420+28x                   /-420

-70=28x                          /:28

-2,5=x