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Liczę na naj ;)))
c) 3 1/4 + 5 1/3 * 4 3/4= 13/4+16/3*19/4=13/4+76/3=39/12+304/12=343/12=28 7/12
e) 5 1/2 * 1 3/4 - 2 3/4 * 3 1/2= 11/2*7/4-11/4*7/4=77/8-77/16=1232/128-616/128=
=616/128=77/16=4 13/16
f ) 5,5 * 2 1/2 * 2,5 * 2 1/2 = 55/10*5/2*25/10*5/2=11/2*5/2*5/2*5/2=1375/16=85 15/16