Question

Proszę o pomoc!!! Musze zrobic te przyklady jak najszybciej !!

a) 8[3(z-1)-1] + 15= -5[3(-2+1) +4z] +4(3z-2)-2

b) 5x-2[4(3x-1) -3x] =1-6x

c) 3(2x - 3) -5(2x -13) +2= 3 (2x -4) -4(4-x) +4

Answer 1

a) 8[3(z-1)-1] + 15 = -5[3(-2+1) +4z] +4(3z-2)-2

8(3z-3-1)+15 = -5(-6+3+4z)+12z-8-2

8(3z-4)+15=-5(-3+4z)+12z-10

24z-32+15=15-20z+12z-10

24z-17=5-8z

32z=22

z=²²/₃₂

z=¹¹/₁₆

 

b) 5x-2[4(3x-1) -3x] = 1-6x

5x-2(12x-4-3x) = 1-6x

11x-2(9x-4) = 1

11x-18x+8 = 1

-7x=-7

x=1

 

c) 3(2x - 3) -5(2x -13) +2 = 3 (2x -4) -4(4-x) +4

6x-9-10x+65+2 = 6x-12-16+4x+4

-4x+58=10x-24

-14x=82

x=-5¹²/₁₄

x=-5⁶/₇

Answer 2

a)8(3z-3-1)+15=-5(-6+3+4z)+12z-8-2

  24z-24-8+15=30-15-20z+12-8-2

  24z+20z=30-15+12-8-2+24+8-15

 44z=34/:44

   34

z=-----

    44

b)5x-2(12x-4-3x)=1-6x

5x-24x+8+6x=1-6x

5x-24x+6x+6x=1-8

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

x=1

b)6x-9-10x+65+2=6x-12-16+4x+4

6x-10x-6x-4x=-65-2-12-16+4

-10x=-91/:(-10)

x=9całych i jedna dziesiąta