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3/7 + 1/5 =15/35+7/35=22/35
5, 5/8 + 6 , 2/3= 5,15/24+6,16,24=11,31/24=12,7/24
4 ,3/4 + 4 3/5 =4,15,20+4,12/20=8,27/20=9,7/20
4, 1/3 - 2 , 4/7 = 4,7/21+2,12/21=6,19/21
8,1/9 - 3, 1/3= 8,1/9+3,3/9=11,4/9
6, 3/5 -3,1/8=6,24/40+3,5/40=9,29/40
5,3/7- 2, 3/4 = 5,12/28+2,21/28=7,33/28=8,5/28
dalej nie wiem bo chyba źle wstawiłaś nawias