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64/10*1/4=16/10
teraz to dodajemy 3/10+16/10=19/10=1,9 ( pierszy nawias )
36/10:1/2=36/10*2=72/10
2 1/4:15/10=9/4:15/10=9/4*10/15=1 1/2
teraz to odejmujemy 72/10-1 1/2=72/10-3/2=72/10-15/10=57/10=5,7( drugi nawias )
teraz odejmujemy oba nawiazy
1,9-5,7=-3,8