Question

zad 1 a) (4-x)-(2x+3)+(x-4)=-(2x-3)-(x+7)

b) (4x-5)+(x-7)-(2x-8)=(-3x+4)-(x-6)

c) -(4-2x)-(2x+4)=(3x-1)+(2x-5)-(7-3x)

zad2

a) 2(x-7)-3(x+2)=4(x+3)+2(x-9)

b) -3(x+6)-6(2x+8)=-2(4-x)+9(x-8)

c) -8(x+2)+3(x+5)=-2(2x+3)+4(2x-1)

d) 6(4-x)+5(2x-5)=4(x-1)-3(4-x)

Answer 1

Zad 1

 

a) (4-x)-(2x+3)+(x-4)=-(2x-3)-(x+7)

4-x-2x-3+x-4=-2x+3-x-7

-x-2x+x+2x+x=-3+4+3+3-7

x=-1

 

b) (4x-5)+(x-7)-(2x-8)=(-3x+4)-(x-6)

4x-5+x-7-2x+8=-3x+4-x+6

4x+x-2x+3x+x=5+7-8+4+6

7x=14  /:7

x=2

 

c) -(4-2x)-(2x+4)=(3x-1)+(2x-5)-(7-3x)

-4+2x-2x+4=3x-1+2x-5-7+3x

2x-2x-3x-2x-3x=4-4-1-5-7

-8x= -13  /:(-8)

x=1,625

 

 

Zad2

 

a) 2(x-7)-3(x+2)=4(x+3)+2(x-9)

2x-14-3x+6=4x+12=2x-18

2x-3x-4x-2x=14-6+12-18

-7x= 2 /:(-7)

x= - 2/7

 

b)  -3(x+6)-6(2x+8)=-2(4-x)+9(x-8)

-3x+18-12x-48=-8+2x+9x-72

-3x-12x-2x-9x=-18+48-8-72

-26x=-50 /:(-26)

x= 1 12/13

 

c)-8(x+2)+3(x+5)=-2(2x+3)+4(2x-1)

-8-16+3x+15= -4x-6+8x-4

-8x+3x+4x-8x=16-15-6-4

-9x=-11 /:(-9)

x=11/9

x=1 3/9

x=1 1/3

 

d) 6(4-x)+5(2x-5)=4(x-1)-3(4-x)

24-6x+10x-25= 4x-4-12+3x

-6x+10x-4x-3x=-24+25-4-12

-3x=-15 /:(-3)

x=5