3/4+2/3=9/12+8/12=17/12=1ц5/12 3/10+2/15=9/30+4/30=13/30= 4/9+1/6=8/18+3/18=11/18 7/15+3/40=64/120+9/120=73/120 6/7-2/3=18/21-14/21=4/21 11/12-5/6=11/12-10/12=1/12 7/12-3/8=14/24-9/24=5/24 9/14-19/35=45/70-38/70=7/70=1/10
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3/4+2/3=9/12+8/12=17/12=1ц5/12 3/10+2/15=9/30+4/30=13/30= 4/9+1/6=8/18+3/18=11/18 7/15+3/40=64/120+9/120=73/120 6/7-2/3=18/21-14/21=4/21 11/12-5/6=11/12-10/12=1/12 7/12-3/8=14/24-9/24=5/24 9/14-19/35=45/70-38/70=7/70=1/10