Răspunsuri

2014-09-24T10:28:19+03:00
(a,b) dp (2,7)
a/2 = b/7 = K
a = 2K   b  7K
a + b = 90
2K + 7K = 90
K = 90 : 9
K = 10
=>
a = 10 x 2 = 20
b = 10 x 7 = 70