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)

4(x+3)=5x-19

4x + 12 = 5x - 19

4x - 5x = - 19 - 12

- x = - 31

x = 31

b)

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

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

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

11m = 12

m = 12/11 = 1 1/11

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 = 1,5 - 1,5 - 1,2

2,1x = - 1,2

x = - 1,2/2,1 = 4/7

d)

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

5/6y - 20/6 - 1/3y - 5/3 + 1/2 = 5/6y - 2/6y - 20/6 - 10/6 + 3/6 = 3/6y - 27/6 = 3/6(y - 9)