40 2/3•39 1/3=?
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![40 2/3•39 1/3=?](/uploads/image/z/42170-50-0.jpg?t=40+2%EF%BC%8F3%26%238226%3B39+1%EF%BC%8F3%3D%3F)
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40 2/3•39 1/3=?
40 2/3•39 1/3=?
40 2/3•39 1/3=?
40 2/3•39 1/3
=(40+2/3)(40-2/3)
=1600-4/9
=1599又5/9
40 2/3•39 1/3=
=122*118/9
=(120+2)(120-2)/9
=(14400-4)/9
=14396/9
=1599又5/9