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c).......=5/4 *8/5 -0,05=5/4*8/5*0,05=2-0,05=1,95
d)3-1/4 2 3/4 11 11 1 1
------- = ------- = ------ : 11 = ------ * ---- = -------
9+2 11 4 4 11 4
--------- kreska ulamkowa
* -mnozenie
np. 3/4 - trzy czwarte