1 1/19*(2 11/15-3/10-1 1/6)=1 1/19*(2 22/30-9/30-1 5/30)=1 1/19*1 8/30=
20/19*19/15=4/3=1 1/3
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1 1/19*(2 11/15-3/10-1 1/6)=1 1/19*(2 22/30-9/30-1 5/30)=1 1/19*1 8/30=
20/19*19/15=4/3=1 1/3