Question

dau coroana! va rog mult​

Answer 1

Răspuns:

Explicație pas cu pas:

Se aplica prop. ale proportiilor

a) y/x = 7/5,  (y-x)/x = (7-5)5 |*1/2

(y-x)/2x = 2/10 = 1/5

b) x/(y-x) = 5/(7-5) = 5/2

c) x(x+y) = 5/(5+7) |*2

2x/(x+y) = 10/12 = 5/6

d) y/x = 7/5,  y/(y+x) = 7/(7+5) |*2

2y/(y+x) = 14/12 = 7/6