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va rog ajutatima 1 supra48+3supra8
7supra49+1supra7
9supra81+1supra9


Răspuns :

1/48+3/8=(1+18)/48=19/48
7/49+1/7=1/7+1/7=2/7
9/81+1/9=1/9+1/9=2/9
1/48+3/8=1/48+18/48=19/48 7/49+1/7=7/49+7/49=14/49 9/81+1/9=9/81+9/81=18/81