6/7 S1= 9/11 S2= 2/3 S3 suy ra 54/63 S1= 54/66 S2= 54/81 S3 Tong so phan bang nhau la: 63+66+81= 210 So thu nhat la: 420 : 210 * 63 = 126 , so thu hai la: 420 : 210 * 66= 132 ; so thu ba la : 420 - [126+ 132]= 162 DS: S1: 126; S2: 132; S3: 162.
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