问题 填空题
先填口诀,再写出两道乘法算式和两道除法算式。 
(1)(    )九五十四  (2)八九(    )

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答案

(1)六;

6×9=54;9×6=54;

54÷9=6;54÷6=9(2)七十二;

8×9=72;9×8=72;

72÷9=8;72÷8=9

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