Question

Zadanie matematyka ;) Daje Najjj a) 3x - 8 = 5x+4 b) (2x - 7 ) - (5x - 7) = 2x - 4 c) 3 * (4x+2) - 2 * (x-9) = 3x - 1 d) -4 * (5x - 7) +2 - (-9x -3)=(3x - 4) * 5

Answer 1

a) 3x-8=5x+4

3x-5x=4+8

-2x=12/: (-2)

x=-6

 

b)(2x - 7 ) - (5x - 7) = 2x - 4

    2x -7-5x-7=2x+4

  2x-5x-2x=4+7+7

-5x=19/ : (-5)

x=-3.8

 

c)3 * (4x+2) - 2 * (x-9) = 3x - 1

12x+6-2x+18=3x-1

12x-2x-3x=-1-6-18

-7x=-25/ : (-7)

x=ok 3.5

 

d)-4 * (5x - 7) +2 - (-9x -3)=(3x - 4) * 5

-20x+28+2+9x+3=15x-20

-20x+9x-15x=-20-28-2-3

-26x=-53/ : (-26)

x=ok 2