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
