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6i1/3+4,5*10=19/3+45=19/3+135/3=154/3=51 1/3
(5i5/6+4,5*1i2/3):4i4/5=(35/6+45/10*5/3)*5/24=(35/6+45/6)*5/24=80/6*5/24=400/144
(1,9+1/9)*10= (19/10+1/9)*10=(171/90+10/90)*10=181/90*10=1810/90=20 1/9