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7,15 - 1 1/5=7,15-1,2=5,95
3 2/3 *1,2=3 2/3*1 2/10=11/3*12/10=132/30=4,4
5 1/4 : 0,125=5,25:0,125=42
(1 1/6 - 3 : 2,4) + 3 1/3=(7/6-1,25)+10/3=(7/6-125/100)+10/3=
(700/600-750/600)+10/3= -1/12+10/3=-1/12+40/12=39/12=13/4=3,25