c上標(biāo)3下標(biāo)5怎么算 c上5下8怎么算？ 2021-03-15 1650 c上5下8怎么算？C8,5=C8,3=8*7*6/3！=56 c上5下8怎么算？C8,5=C8,3=8*7*6/3！=56
