4 1/9×0,9=37/9*9/10=37/10=3 7/10
8/21: 0,5==8/21:5/10=8/21:1/2=(8*2)/21=16/21
3,5: 4 2/3=3 1/2:4 2/3=7/2:14/3=7/2*3/14=
3/4
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4 1/9×0,9=37/9*9/10=37/10=3 7/10
8/21: 0,5==8/21:5/10=8/21:1/2=(8*2)/21=16/21
3,5: 4 2/3=3 1/2:4 2/3=7/2:14/3=7/2*3/14=
3/4