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  • Utilizator Brainly
2014-03-01T09:54:35+02:00
0,2(7)=(27-2)/90=25/90 ⇒ 2a/9b=25/90 ⇒ 2a/b=25/10=5/2 ⇒ 8a/5b=20/10 ⇒ (8a+5b)/5b=(20+10)/10 ⇒ (8a+5b)/b=30/2=15;
2a/b=5/2 ⇒ 18a/10b=45/20 ⇒ (18a-10b)/10b=(9a-5b)/5b=(45-20)/20=25/20 ⇒
(9a-5b)/b=25/4.
Impartim cele 2 relatii: (8a+5b)/(9a-5b)=15·4/25=12/5.
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