A). 1 1/3 * 1 1/3 - 1 /1/3 : 5/9 - o, 6 : 1 4/5 =
B). 1, 6 * 1/4 + 2/5 : 9, 5 - 3 1/3 * 1 4/5 =
C). 20 7/15 - 18 2/3 + 2, 2 : 0, 001 * 0, 05 =
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a)4/3*4/3-4/3*9/5-3/5:5/9=16/9-12/5-1/3=80/45-60/45-15/45=5/45=1/9
b)2/5+2/5*19/2-10/3*9/5=2/5+19/5-6=21/5-6=4 1/5-6=-14/5
c)307/15-56/3+2,2*1000*0,05=307/15+168/15+2200*0,05=139/15+110=9,3+110=119,3