Răspuns:
Explicație pas cu pas:
x/y = 2/7
a)
y/x = 7/2
b)
2x/3y = 2/3*x/y = 2/3*2/7 = 4/21
c)
7x = 2y
y = 7x/2
x + y = x + 7x/2 = 2x/2 + 7x/2 = 9x/2
x/(x + y) = x/(9x/2) = 2/9
d)
x = 2y/7
2x + 3y = 4y/7 + 21y/7 = 25y/7
(2x + 3y)/3y = (25y/7)/3y = 25/21
e)
3x + 5y = 6y/7 + 35y/7 = 41y/7
(3x + 5y)/8y = (41y/7)/8y = 41/56
