Oblicz
a) 1 3/4 * 1 1/7- 3 : 4 1/2=
b) 1 5/7*(2 3/4-1 2/3:4)=
c) 3 1/3*(2 1/4-1 1/2:5)=
d) 3 1/4+ 1/2 / 3 1/3* (1 5/6-1 1/12=
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