1x1x2=2
3x2x1=6
3x3x1=9
3x2x2=12
9x3x1=27 sau 3x3x3=27
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1*1*2
6:
1*2*3
9:
1*3*3
12:
3*2*2
27:
1*3*9
1x1x2=2
3x2x1=6
3x3x1=9
3x2x2=12
9x3x1=27 sau 3x3x3=27