13/21×17+17/12×8,简算.
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![13/21×17+17/12×8,简算.](/uploads/image/z/34346-2-6.jpg?t=13%2F21%C3%9717%EF%BC%8B17%2F12%C3%978%2C%E7%AE%80%E7%AE%97.)
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13/21×17+17/12×8,简算.
13/21×17+17/12×8,简算.
13/21×17+17/12×8,简算.
13/21×17+17/12×8
=17*(13/21+8/12)
=17*(13/21+2/3)
=17*9/7
=153/7
(13/21Λ2/3)17=(13/21Λ14/21)=27x17/21=153/7