Question

równania.-.- s.o.s

zad.7

a) 3(3-x) +2x= 8 -2(x-1)

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

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

d) x-(7+2x)=2(x-1)+1

Answer 1

a) 9-3x+2x=8-2x+2

9-8-2=-2x+3x-2x

-1=-1x/:(-1)

1=x

x=1

b) 4x+5-3x-6=4+2x-4

x-1=2x

x-2x=1

-x=1/:(-1)

x=1

c)4-15+5x=-x-3+2x

-11+5x=x-3

5x-x=-3+11

4x=8:(4)

x=2

d)x-7-2x=2x-2+1

-7-x=2x-1

-x-2x=-1+7

-3x=6:(-3)

x=-2

Answer 2

a) 9-3x + 2x = 8 - 2x + 2

9 - 5x = 10 - 2x  | -9

-5x = 1 - 2x | +2x

- 3x = 1 | :3

-x = 1/3

x = -1/3

 

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

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

x-1 = 2x | -x

-1 = x

 

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

4-15+5x = -x-2+2x

-11 + 5x = x-2 |+11

5x = x+9 |-x

4x = 9| :5

x = 1 4/5

 

d) x-(7+2x) = 2(x-1) +1

x-7-2x = 2x-2 +1

-x-7 = 2x-1 | +7

-x = 2x+6 | -2x

-3x = 6 | :-3

x = -2

 

 

jakby co, to np. -1/3 to ułamek, ale już dałam sobie spokój z szukaniem tego jak to napisać ;d