除数是 9

2÷9＝0.222

3÷9＝0.333

＝0.2&＝0.1&×2

＝0.3&＝0.1&×3

4÷9 = 0. 444 = 0. 4&= 0.1&×4

8÷9 = 0. 888 = 0. 8&= 0.1&×8

根据上面的规律，你能很快地求得下列各题的商来吗？ 13÷9 35÷9 16÷36

88÷72 640÷720 17÷0.9

解：13÷9 = （9 + 4）÷9 = 1.4&

35÷9＝（27＋8）÷9＝3.8&

16÷36 = （16÷4）÷（36÷4） = 4÷9 = 0.4&

88÷72 = （88÷8）÷（72÷8） = 11÷9 = 1.2&

640÷720＝64÷72＝8÷9＝0.8&

17÷0.9 = 170÷9 = （17÷9）×10 = 1.88

×10 = 18.8&

1÷99＝0.010101

2÷99＝0.020202

3÷99＝0.030303