核心提示： 3×1-1＝ 2×5＝ 8×3＝
|
3×1-1＝
|
2×5＝
|
8×3＝
|
2×4＝
|
|
5×6＝
|
5×7＝
|
5×8＝
|
5×9＝
|
|
9×6＝
|
9×7＝
|
9×8＝
|
9×9＝
|
|
3×6＝
|
3×7＝
|
3×8＝
|
3×9＝
|
|
8×1＝
|
8×2＝
|
8×3＝
|
8×4＝
|