1)5/6 + 7/20=50/60+21/60=71/60:2=71/60*1/2=71/120
2) 1 3/7+2 5/21=1 9/21+2 5/21=3 14/21=3 2/3 : 2=11/3*1/2=11/6=1 5/6
3) 2 3/5+3 3/10+2 1/2=2 6/10+3 3/10+2 5/10=7 14/10=8 2/5:3=42/5*1/3=14/5=2 4/5
4) 7 5/24+6 7/24+8 1/6=7 5/24+6 7/24+8 4/24=21 19/24:3=523/24*1/3=523/72=7 19/72
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1)5/6 + 7/20=50/60+21/60=71/60:2=71/60*1/2=71/120
2) 1 3/7+2 5/21=1 9/21+2 5/21=3 14/21=3 2/3 : 2=11/3*1/2=11/6=1 5/6
3) 2 3/5+3 3/10+2 1/2=2 6/10+3 3/10+2 5/10=7 14/10=8 2/5:3=42/5*1/3=14/5=2 4/5
4) 7 5/24+6 7/24+8 1/6=7 5/24+6 7/24+8 4/24=21 19/24:3=523/24*1/3=523/72=7 19/72