Question

Raportul numerelor x si y este 2/5. Calculati raportul dintre :
a)3x si y;
b)x si 5y;
c)1/3 x si 1/2 y;
d)y² si x².

Answer 1

daca  x/y = 2/5  atunci:

a).  3x / y = 3 * (x/y) = 3* (2/5) = 6/5 ;
b).  x / 5y =(x/y) : 5 = (2/5) :5 = 2/5 * 1/5 = 2/25 ;
c).  (1/3 )x / (1/2) y = x/3 : y/2 = x/3 * 2/y = (x/y)*(2/3)=2/5*2/3=4/15 ;
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                ↑
 daca avem (1/3)*x si (1/2)*y
d).  y²/x² = (y/x)² = (5/2)² = 25/4 ;