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b) (3,5 - 2 1/3 : 4/3) + 2 1/4 = (3,5-7/3*3/4)+2 1/4=(3,5-1,75)+2,25=1,75+2,25=4
c) 2 1/3 + (4 : 3,2 - 1 1/3) =2 1/3+(1 1/4-1 1/3)=
2 4/12+(1 3/12-1 4/12)=2 4/12+ (-1/12)=2 4/12-1/12=1 1/4