Question

rozwiaz rownania : a) 2x +5 =14.8 + (x-3) b) 1/4x -( 4+1/2x)=-2 c) 2(3-x) - 4(x-5)=2x+2 d) 1/3 * (razy) (-6x+9) -4 =-5 (x+1) e) 0.2 * (10-5x) =3+2(x-1) f) 37= (20-4x) * 0,5 -7x


dziękuje :))

Answer 1

a)2x+5=14,8+(x-3)

2x+5=14,8+x-3

2x-x=-3+14,8-5

x=6,8

 

b)1/4x-(4+1/2x)=-2

1/4x-4-1/2x=-2

1/4x-1/2x=-2+4

1/4x-2/4x=2

-1/4x=2  /*(-4)

x=-8

 

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

6-2x-4x+20=2x+2

-2x-4x-2x=2-20-6

-8x=-24   /:(-8)

x=3

 

d)1/3*(-6x+9)-4=-5(x+1)

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

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

3x=-4   /:3

x=-4/3

x=-1  1/3

 

e)0,2*(10-5x)=3+2(x-1)

2-x=3+2x-2

-x-2x=-2+3-2

-3x=-1   /:(-3)

x=1/3

 

f)37=(20-4x)*0,5-7x

37=10-2x-7x

2x+7x=10-37

9x=-27   /:9

x=-3

 

Answer 2

a) 2x + 5 = 14,8 + ( x - 3 )

2x + 5 = 14,8 + x - 3

2x - x = 14,8 - 3 - 5

x = 6,8

 

b) 1/4x - ( 4 + 1/2x ) = - 2

1/4x - 4 - 1/2x = - 2

1/4x - 2/4x = - 2 + 4

- 1/4x = 2 / : ( - 1/4 )

x = - 8

 

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

6 - 2x - 4x + 20 = 2x + 2

- 2x - 4x - 2x = 2 - 6 - 20

- 8x = - 24 / : ( - 8 )

x = 3

 

d) 1/3 · ( - 6x + 9 ) - 4 = - 5 ( x + 1 )

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

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

3x = - 4 / : 3

x = - 1 1/3

 

e) 0,2 · ( 10 - 5x ) = 3 + 2 ( x - 1 )

2 - x = 3 + 2x - 2

- x - 2x = 3 - 2 - 2

- 3x = - 1 / : ( - 3 )

x = 1/3

 

f) 37 = ( 20 - 4x ) · 0,5 - 7x

37 = 10 - 2x - 7x

37 - 10 = - 2x - 7x

27 = - 9x / : ( -9 )

- 3 = x

 

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