1. 3/7+1/7=4/7; 4/11=5/11=9/11 ; 3/8-1/8=2/8 ; 6/13+7/13=13/13=1 ; 4/5-2/5=2/5 ;
3/10+1/10=4/10 ; 7/8-3/8=4/8 ; 9/10-7/10=2/10.
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1. 3/7+1/7=4/7; 4/11=5/11=9/11 ; 3/8-1/8=2/8 ; 6/13+7/13=13/13=1 ; 4/5-2/5=2/5 ;
3/10+1/10=4/10 ; 7/8-3/8=4/8 ; 9/10-7/10=2/10.