(21/17)(8/3-3/4)+(17*11/12)/(17/21)
=(21/17)(23/12)+(215/12)/(17/21)
=21*23/17*12+215*21/12*17
=483/204+4515/204
=4998/204
=(24*204+102)/204
=24*1/2
得数是:二十四又二分之一
(21/17)(8/3-3/4)+(17*11/12)/(17/21)
=(21/17)(23/12)+(215/12)/(17/21)
=21*23/17*12+215*21/12*17
=483/204+4515/204
=4998/204
=(24*204+102)/204
=24*1/2
得数是:二十四又二分之一