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a) 1 1/5+3 1/2=6/5+7/2=12/10+35/10=47/10=4 7/10
b) 8 4/6-4 1/3=52/6-13/3=52/6-26/6=26/6=4 2/6
c) 1 5/13*2 3/5=18/13*13/5=18/5=3 3/5
d) 6 3/4:1 4/5= 27/4:9/5=27/4*5/9=15/4=3 3/4
12.
1,62+6,92=8,54
10,28-1,74=8,54
3,84*2,25=8,64
10,248:1,2=8,54
Liczb rzymskich niestety nie umiem