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1 1/4-2/3+2 5/6 =5/4-2/3+17/6=15/12-8/12+34/12=41/12=3 5/12
7 10/35+5 4/7- 3 2/5= 255/35+ 39/7- 17/5= 255/35+195/35-119/35=331/35=9 16/35
1 13/25+17/25-1 4/5= 38/25+17/25-9/5=55/25-45/25=10/25=2/5
zad 2
6 3/10+ 3 4/5- 3 2/5 +3 1/2= 63/10+38/10-85/10+35/10=51/10= 5 1/10