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Toán học cơ số 8
1. Bảng cửu chương:
2x1=2
2x2=4
2x3=6
2x4=10
2x5=12
2x6=14
2x7=16
2x10=20
3x1=3
3x2=6
3x3=11
3x4=14
3x5=17
3x6=22
3x7=25
3x10=30
4x1=4
4x2=10
4x3=14
4x4=20
4x5=24
4x6=30
4x7=34
4x10=40
5x1=5
5x2=12
5x3=17
5x4=24
5x5=31
5x6=36
5x7=43
5x10=50
6x1=6
6x2=14
6x3=22
6x4=30
6x5=36...