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