Question

Determina x din egalitatile ​

Answer 1

Răspuns:

Explicație pas cu pas:

(x + 2)/x = 9/7

7(x + 2) = 9x

7x + 14 = 9x

9x - 7x = 14

2x = 14

x = 14 : 2 = 7

______________

x/(x + 1) = 2/13

13x = 2(x + 1)

13x = 2x + 2

13x - 2x = 2

11x = 2

x = 2/11

_____________

x/5 = (x + 2)/25

25x = 5(x + 2)

25x = 5x + 10

25x - 5x = 10

20x = 10

x = 10/20 = 1/2

Answer 2

Explicație pas cu pas:

(x+2)/x=9/7

7(x+2)=9x

7x+14=9x

7x-9x=-14

-2x=-14

x=7

x/x+1=2/13

13x=2(x+1)

13x=2x+2

13x-2x=2

11x=2

x=2/11

x/5=(x+2)/25

25x=5x+10

25x-5x=10

20x=10

x=1/2=0,5