Question

rozwiąż równania.

a) -3x = 2x - 10

b) 2x - 2 = 7 - x

c) 10 = 4 - 2x

d)-(2x - 1) = 4

e)2(x + 1) = x

f)2t -(3t + 1) = 6

g)-(4 + x) = 2(3 - x)

h)3(y + 6)- y = 2(y +9)

i)(x - 7) - 2(3x+5) = 3

BŁAGAAM ! DAM NAJ !!

Answer 1

a) -3x -2x=-10

-5x=-10/-5

x=2

 

b)2x+x=7+2

3x=9

x=3

 

c) 10-4=-2x

-2x=6

x=-3

 

d)-2x+1=4

-2x=3

x=-(3/2)

 

e)2x+2=x

2x-x=-2

x= -2

 

f) 2t -3t-1=6

-t=7/ (-1)

t=-7

 

g) -4 -x=6-2x

-x +2x=6+4

x=10

 

h) 3y+18 -y=2y+18

2y-2y=18-18

0=0

 

 

Answer 2

a)

-3x = 2x -10

-3x - 2x = -10

-5x = -10 |:(-5)

x = 2

 

b)

2x - 2 = 7 - x

2x + x = 7 + 2

3x = 9 |:3

x = 3

 

c)

10 = 4 - 2x

10 - 4 = - 2x

6 = - 2x |:(-2)

-3 = x

x = -3

 

d)

-(2x - 1) = 4

-2x + 1 = 4

-2x = 4 - 1

-2x = 3 |:(-2)

x = -1½

 

e)

2(x+1) = x

2x + 2 = x

2x - x = -2

x = -2

 

f)

2t - (3t + 1) = 6

2t - 3t - 1 = 6

2t - 3t = 6 + 1

-t = 7 |:(-1)

t = -7

 

g)

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

-4 - x = 6 - 2x

-4 - 6 = -2x +x

-10 = -x |:(-1)

10 = x

x = 10

 

h)

3(y+6) - y = 2(y+9)

3y + 18 - y = 2y+18

3y - y - 2y = 18 - 18

0 = 0

 

To równanie jest równaniem tożsamościowym.

 

i)

(x-7) - 2(3x+5) = 3

x - 7 - 6x - 10 = 3

x - 6x = 3 + 7 + 10

-7x = 20 |:(-7)

x = 2 

 

 

 

 

 

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