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Află numărul necunoacut:10:C=20:10.318+25:a=343.b×475+2=447.

Răspuns :

10÷c=20÷10⇒
⇒10c=2⇒c=10/2⇒c=5
318+25÷a=343⇒25a=343-318⇒25a=25⇔a=25/25⇒a=1
b×475+2=447⇒475=447--2⇒445b=445⇒b=1