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,](/uploads/image/z/606811-67-1.jpg?t=68-59%2B99%2B101%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E6%80%8E%E4%B9%88%E7%AE%97%E5%95%8A%2C%E5%BF%98%E4%BA%86%2C)
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68-59+99+101的简便计算怎么算啊,忘了,
68-59+99+101的简便计算怎么算啊,忘了,
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