Question

Wykonaj działania :

a) 3(2a - 7) = .................................

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

c) (8c + 2) : 2 =

d) -(5b - 1) =

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

Daję naj !. :)

Answer 1

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

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

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

d.). -½(5b-1)=-2½b+½

 

2a - 3 = a + 1

2a -a = 1 + 3

a = 4

 

4b + 3 = 3b - 4

4b - 3b = -4 -3

b = -7

 

7+ 3c = -5 + 2c

3c - 2c = -5 -7

c = -12

 

5d + 2 = 3d

5d - 3d = -2

2d = -2   / : 2

d = -1

 

6e - 7 = 9e + 5

6e - 9e = 5 + 7

- 3e = 12    /:(-3)

e = -4

 

6f - 1 = f + 2

6f - f = 2 + 1

5f = 3         / : 5

f =  ⁵/³

f = 1 2/3