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a supra 7 = 5 supra 3; a+7 supra 7
multumesc


Răspuns :

a/7=5/3
=>a=7*5/3
a=35/3
(a+7)/7=(35/3+7)/7=(35+21)/3*7=56/21=8/3
a/7=5/3 ⇒3×a=7×5 ⇒a=35/3
(35/3+7)/7=
(35+21)/3/7=
(56/3)÷7=
56/3×1/7=
56/21⁽⁷=8/3