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Ex 14 a) inpartiti numarul 4960 in parti direct proportionale cu numerele 8,15,17.

Răspuns :

{ a,b,c } d.p { 8,15,17 } 
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a + b + c = 4960
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a / 8 = b / 15 = c / 17 = K

a / 8 = K => a = 8 K
b / 15 = K => b = 15 K
c / 17 = K => c  = 17 K

8 K + 15 K + 17 K = 4960
23 K + 17 K = 4960
40 K = 4960
K = 4960 : 40
K = 124

a = 124 x 8 = 992

b = 124 x 15 = 1860

c = 124  x 17 = 2108