1-6. 곱셈
1 8 x 9 =
2 6 x 8 =
3 3 x 4 =
4 4 x 4 =
5 4 x 7 =
6 1 x 4 =
7 2 x 3 =
8 3 x 2 =
9 4 x 6 =
10 1 x 4 =
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