Răspuns :
[tex] \frac{a}{b} = \frac{2}{7} [/tex] ⇒ a=2 ,b=7
[tex] \frac{a}{a+b} = \frac{2}{2+7} = \frac{2}{9} [/tex]
[tex] \frac{a}{a+b} = \frac{2}{2+7} = \frac{2}{9} [/tex]
a 2
-----=------- ⇒a*7=b*2⇒a=2 si b=7
b 7
a 2 2
-----------= ---------------- = --------------------
a+b 2+7 9
-----=------- ⇒a*7=b*2⇒a=2 si b=7
b 7
a 2 2
-----------= ---------------- = --------------------
a+b 2+7 9