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5,5:(19/4-17/2)=
5,5:(19/4-34/4)=
5,5:(-15/4)=
11/2*(-4/15)=-22/15 = -1 7/15
b) 3,5*1 1/14-7,25=
7/2*15/14-29/4=
15/4-29/4=-14/4=-3,5
c) 6,4*(4,5-3 3/4)+4,5:(1/2)^2=
6,4*(4,5-3,75)+4,5:0,25=
6,4*0,75+18=
4,8+18=22,8