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1 supra 3 +2 supra 3 : 1 supra 9 +1

Răspuns :

1/3+2/3:1/9+1=1/3+6+1=1/3+7=22/3
1/3+2/3 × 9/1 +1/1=
1/3+6/1+1/1=  aducem la acelasi numitor..3 =
1/3+18/3+3/3=22/3