Question

to tylko cztery przykłady z matmy ;D

4\7 z = -14 +2

3(b-2)= -5 +b

2 (x-3) = 3x-4

3 (5-x) 2 (x-3)

Answer 1

4\7 z = -14 +2

4/7z=-12 /:(4/7)

z=(-12):4/7

z=-21

 

3(b-2)= -5 +b

3b-6=-5+b

3b-b=-5+6

2b=1 /:2

b=1/2

 

 

2 (x-3) = 3x-4

2x-6=3x-4

2x-3x=-4+6

-x=2 /:(-1)

x=-2

 

 

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

15-3x=2x-6

-3x-2x=-6-15

-5x=-21 /:(-5)

x=4 1/5