Question

Nu trebuie sa rezolvați neapărat toate exercitiile​

Answer 1

Răspuns:

Explicație pas cu pas:

26.

x/2 = y/3 = k

x = 2k

y = 3k

a)

(x + y)/2x = (2k + 3k)/4k = 5k/4k = 5/4

e)

(10x + y)/(7x - y) = (20k + 3k)/(14k - 3k) = 23k/11k = 23/11

_________________

27.

0,5 = 5/10 = 1/2

0,2 = 2/10 = 1/5

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

2x = 5y

x = 5y/2

a)

(3x + 2y)/(x + y) = (15y/2 + 2y)/(5y/2 + y) = (15y/2 + 4y/2)/(5y/2 + 2y/2) =

= (19y/2)/(7y/2) = 19/7

b)

7x/4y = (35y/2)/4y = 35y/8y = 35/8