14/15*10/49+5 3/7= 1 2/3*14/15*5/7= 1/3*6/7-1/7*3/4= (1-3/4)*(4/5-3/4)= 1 3/11-27/44*4/9
14/15*10/49+5 3/7=118; 1 2/3*14/15*5/7=10/9; 1/3*6/7-1/7*3/4=105; (1-3/4)*(4/5-3/4)=1/80; 1 3/11-27/44*4/9=1