68-59+99+101的简便计算怎么算啊,忘了,
问题描述:
68-59+99+101的简便计算怎么算啊,忘了,
答
68-59+99+101 =(68-59)+(99+101) =9+200 =209
答
(101+99)+(68-59) =200+9 =209