5分之2除以（5分之2+4分之3）乘24分之23
=2/5÷23/20×23/24
=2/5×20/23×23/24
=2/5×5/6
=1/313.6乘5-1.632除以0.1613.6乘5-1.632除以0.16=68-10.2=57.8