а)(54*13/14)*7/13=702/13*7/13=4914/169=29 1/13
в)(12/13*14/17)*(17/14*13/24)=168/221*221/336=168/336=1/2
д)21/22*(22/23*24/25)*23/24=21/25
г)(2/3*4/5)*(3/4*5)*(6/7*8/9)*(7/8*9/10)=12/10=1 1/5
а)(54*13/14)*7/13=702/13*7/13=4914/169=29 1/13
в)(12/13*14/17)*(17/14*13/24)=168/221*221/336=168/336=1/2
д)21/22*(22/23*24/25)*23/24=21/25
г)(2/3*4/5)*(3/4*5)*(6/7*8/9)*(7/8*9/10)=12/10=1 1/5