2✕2=, 4, 5, 10×5, 50, 20, 3 × 2, 6, 8, 5×4, 15, 20, 5×5, 20, 25, 8×5, 40, 20, 9×1, 18, 9, 3×9 , 21, 27, 6 × 9 , 54, 36, 8 × 9 , 45, 72.

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恢復自動保存: ?