Question

pomocy... nic z tego nie czajęęęęęęęę! a) 3-11x=-3(x+2)

B) 3(X-2)+4=2(X+1 )

c)3(x-1)=6(x+1)+12

d)1/4+2/5 x +1/4=2

e)2/3 x - 1/2=4

f)3/7x-1=x

G)(4x-6):2-6x=2

pomocy+ to ma być na poziomie SP!

Answer 1

a) 3- 11x = -3(x +2)

3- 11x = -3x - 6

-11x + 3x = -6 -3

-9x = -9 / (-9)

x = 1

 

b) 3(x - 2) + 4 = 2 ( x + 1)

3x - 6 + 4 = 2x + 2

3x - 2x = 2 + 6 - 4

x= 4

 

c) 3(x-1) = 6 (x + 1) + 12

3x -3 = 6x + 6 + 12

3x - 6x = 6+12 + 3

-3x = 21 / (-3)

x = 7

 

d) 1/4 + 2/5x + 1/4 = 2

2/5x = 2 -1/4 - 1/4

2/5x = 1,5 /  2/5

x = 3,75

 

e) 2/3x - 1/2 = 4

2/3x = 4 + 1/2

2/3x = 4,5 /   2/3

x= 6,75

 

f) 3/7x - 1 = x

3/7x -x = 1

-4/7 x = 1 /   (-4/7)

x = 1,75

 

g) (4x - 6) : 2 - 6x = 2

4x - 6 : 2 - 6x = 2

4x - 3 - 6x = 2

4x - 6x = 2 + 3

-2x = 5 / (-2)

x = 2,5

 

 

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