Răspunsuri

2014-08-17T12:45:30+03:00
A/b= 3/8

a/3= b/8= k

a=3k
b=8k

(5a+7b)/(2b+3a) =  (5*3k+7*8k)/(2*8k +3*3k)=

= (15k+56k)/(16k+9k)=

=  71k/25 k= 71/25
ok
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