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b)0,6 : 2/3=3/5 ·3/2=9/10=0,9
c)3/4 · 5,2 - 2,2 : 1 5/6=3/4 · 5 1/5 - 2 1/5 : 1 5/6=3/4 · 26/5 - 11/5 · 6/11=18/5 - 6/5=12/5=2,4
d) 3,6 - 2,5=1,1
e)11,4 - 8 1/3=11 2/5 - 8 1/3=11 6/15 - 8 5/15=3 1/15