6/7*3/8:1,5+ 1/5=9/28*10/15+1/5=
=3/14+1/5=15/60+14/60=29/60
4/5*10/6+1 3/5*1/6=4/3+8/5*1/6=
=4/3+4/15=20/15+4/15=24/15=8/3=
=2 2/3
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6/7*3/8:1,5+ 1/5=9/28*10/15+1/5=
=3/14+1/5=15/60+14/60=29/60
4/5*10/6+1 3/5*1/6=4/3+8/5*1/6=
=4/3+4/15=20/15+4/15=24/15=8/3=
=2 2/3