Question

va rogggggggghgg.....​

Answer 1

Răspuns:

Explicație pas cu pas:

13.

x/y = 5/7

x/5 = y/7 = k

x = 5k

y = 7k

a)

y - x = 7k - 5k = 2k

2x = 2*5k = 10k

2k/10k = 2/10 = 1/5

b)

x = 5k

y - x = 2k

5k/2k = 5/2

c)

2x = 10k

x + y = 5k + 7k = 12k

10k/12k = 10/12 = 5/6

d)

2y =2*7k = 14k

x + y = 12k

14k/12k = 14/12 = 7/6

______________

14.

3x/2y = 1,25

x/y = 1,25*2/3 = 125/100*2/3 = 5/4*2/3 = 10/12 = 5/6

x/5 = y/6 = k

x= 5k

y = 6k

de aici continui tu dupa modelul de la ex 13. Succes!