Răspuns:
Explicație pas cu pas:
7x/3y = 4/3
x/y = 4/3 : 7/3 = 4/3*3/7 = 4/7
y/x = 7/4
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a)
(2y - x)/x = 2y/x - 1 = 2*7/4 - 1 = 7/2 - 2/2 = 5/2
b)
(2x - y)/y = 2x/y - 1 = 2*4/7 - 1 = 8/7 - 7/7 = 1/7
c)
(4x - y)/x = 4 - y/x = 4 - 7/4 = 16/4 - 7/4 = 9/4