Question

zadanie 1.

oblicz:

2-3x - x-1 = 0,3 x - 1-2x

------- ----- ------

3 2 6

zadanie 2.

1/2 [x-(24-x)]=1/5x

/ - kreska ułamkowa

Answer 1

1. .......... / * 6

2 * (2 - 3x) - 3 * (x - 1) = 6 * (0,3x ) - 1 * (1 - 2x)

4 - 6x - 3x + 3 = 1,8x - 1 + 2x

7 - 9x = 3,8x - 1

-9x - 3,8x = - 1 - 7

-12,8x = -8

x = -8 : (-12,8)

x = 80/128 = 20/32

x = 5/8

 

2.

1/2* [ x - (24 - x)] = 1/5x ----- / * 10

5 * [ x - 24 + x ] = 2x

5 * (2x - 24) = 2x

10x - 120 = 2x

10x - 2x = 120

8x = 120

x = 120/8

x = 15