Question

先计算出前三道题，然后找出规律，填出各数．

2.1×0.9＝________

3.21×0.9＝________

4.321×0.9＝________

________×0.9＝________

________×0.9＝________

________×0.9＝________

Answer 1

答案：1.89,2.889,3.8889,5.4321,4.88889,6.54321,5.888889,7.654321,6.8888889