解： 5/12 * (( 3/4 + 1/3 )/ 5/6 ) =5/12 / 5/6 *(3/4 + 1/3) =1/2 * 13/12 =13/24
13/24
5/12 * (( 3/4 + 1/3 )/ 5/6 ) =5/12 / 5/6 *(3/4 + 1/3) =1/2 * 13/12 =13/24
