28/27*19-19/27如何简便计算
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![28/27*19-19/27如何简便计算](/uploads/image/z/24788-20-8.jpg?t=28%2F27%2A19-19%2F27%E5%A6%82%E4%BD%95%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
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28/27*19-19/27如何简便计算
28/27*19-19/27如何简便计算
28/27*19-19/27如何简便计算
28/27*19-19/27
=19/27*28-19/27
=19/27*(28-1)
=19/27*27
=19
28/27 * 19 - 19/27
= (19/27) * 28 - 1* (19/27)
= (28-1)* 19/27
= 27 * 19/27
= 19
28/27*19-19/27=19/27(28-1)=19/27 * 27=19