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nr 3 ,x ,5 , sunt direct proportionale cu y, 54, 45. Calculati x+y si y -x

Răspuns :

{3;x;5} dp{y;54;45}
[tex] \frac{3}{y} = \frac{x}{54} = \frac{5}{45} [/tex]
[tex] \frac{3}{y} = \frac{5}{45} [/tex]
y=27
[tex] \frac{x}{54} = \frac{5}{45} [/tex]
x=6
x+y=27+6=33
y-x=27-6=21