Question

zad1.

a) 3x+4x=

6x-x=

-8x+5x=

x-4x=

b) 2a+1+a=

4a-5a-3=

6b-6a+2b=

c) 4*7y=

12y:6=

(-8y)*1/2=

10a: (-2)=

zad2. rozwiąż równania:

2a-3=a+1

4b+3=3b-4

7+3c=-5+2c

5d+2=3d

6e-7=9e+5

6f-1=f+2

zad.3.wykonaj działanie:

a) 3(2a-7)=

b) (-d+3)*(-1)=

c) (8c+2):2=

d) -1/2(5b-1)=

PLIS PILNE !!!!!!!!

Answer 1

1.

a)

7x

5x

-3x

-3x

 

b)

3a+1

-1a-3

8b-2a

 

c)

28y

2y

-4y

-5a

 

Zad2

 

a=4

b = -7

c= -12

d= -1

e= -4

f =

 

ZAd3

 

a)6a- 21

b)d-3

c)4c + 1

d)-2,5b + 0,5

Answer 2

1.

a) 3x+4x = 7x

6x-x = 5x

-8x+5x = -3x

x-4x = -3x

 

 

 

 

b) 2a+1+a = 3a + 1

4a-5a-3 = -a - 3 

6b-6a+2b = -6a + 8b

c) 4*7y = 28y

12y:6 = 2y

(-8y)*1/2  =  -4y

10a: (-2) =  -5a

 

2.

a)

2a-3=a+1

2a - a = 3 + 1

a = 4

 

b)
4b+3=3b-4

4b - 3b = -4 - 3

b = -7

 

 

c)
7+3c=-5+2c

3c - 2c = -5 - 7

c = -12

 

 
d)
5d+2=3d

5d - 3d = -2

2d = -2    /:2

d = -1

 
e)
6e-7=9e+5

6e - 9e = 5 + 7

-3e = 12    /:(-3)

e = -4

 

 
f)
6f-1=f+2

6f - f = 2 + 1

5f = 3    /:5

f = 3/5  lub 0,6

 

 

 

3.

a) 3(2a-7) = 6a -21

b) (-d+3)*(-1) = d - 3

c) (8c+2):2 = 4c + 1

d) -1/2(5b-1) = -2,5b + 0,5