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2014-08-22T17:21:14+03:00
0,4(4)=  (44-4)/90=  40/90= 4/9

4 1/2= 9/2

15 * 4/9 * 9/2=15 * 2=30
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2014-08-22T22:11:44+03:00
0,4(4)=
44-4/90=
40/90=
 4/9

15*4/9*4 1/2=
15*4/9*9/2=
60/9*9/2=
540/18=
30



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