Question

Rozwiąż równanie :

a)4(x+3)=5x-19

b)2(2m-3)+2m=5(3-m)+1

c)1,2-1,9x=0,5(x+3)-0,3(x+5)

d)5/6(y-4)-1/3(y+5)+1/2

Answer 1

a)

4x +12= 5x-19 

4x - 5x = -19 -12

-x = -31| : (-1)

x = 31

 

b)

4m - 6 +2m = 15 - 5m +1 

4m +2m +5m = 15 +1 +6

11m = 22|:11 

m = 2

 

c)1,2 - 1,9x = 0,5x +1,5 - 0,3x -1,5 

-1,9x - 0,5x+0,3x=-12

-2,1x=-1,2|: (-2,1 )

x = 1,2/ 2,1

x= 12/10 * 10/21 = 12 / 21 = 4/7

 

d)

tu nie ma równiania z L i P

więc 

5/6 (y - 4) - 1/3 (y+5)+1/2 

5/6y - 10/3 -1/3y +5/3 +1/2 |*6 

5y - 20 -2y +10+3 = -7y -7 

 

 

 

 

Answer 2

a) 4(x+3)=5x-19

4x+12=5x-19

4x-5x=-12-19

-x=-31/-1

x=31

b) 2(2m-3)+2m=5(3-m)+1

4m-6+2m=15-5m+1

4m+2m+5m=6+15+1

11m=22/11

m=2

c)  1,2-1,9x=0,5(x+3)-0,3(x+5)

1,2-1,9x=0,5x+1,5-0,3x-1,5

-1,9x-0,5x+0,3x=-1,2+1,5-1,5

-2,1x=-1,2/-2,1

x=0,57

d))5/6(y-4)-1/3(y+5)+1/2

15y-60-6y-30+9

9y-81