除数是 99
=0.0&1&
=0.0&2&=0.0&1&×2
=0.0&3&=0.0&1&×3
4÷99 = 0. 040404 = 0. 0&4&= 0. 0&1&×4
9÷99=0.090909
=0.0&9&=0.0&1&×9
根据上面的规律,你能很快求出下列各题的商吗? 17÷99 92÷99 123÷99 80÷99
500÷99 6÷9.9 6.3÷99 5.24÷0.99
解:17÷99 = 0.01&×17 = 0.1&7&
92÷99=0.01&×92=0.9&2&
123÷99=(99+24)÷99=1.2&4&
80÷99=0.0&1&×80=0.8&0&
500÷99 = (5÷99)×100=0.0&5&×100=5.0&5&
6÷9.9=60÷99=(6÷99)× 10 = 0.0&6&×10=0.6&0&
6.3÷99 = (63÷99)÷10 = 0.06&3&
5.24÷0.99=524÷99=(495+29)÷99 = 5+0.2&9&= 5.2&9&
1÷11=0.090909
2÷11=0.181818
3÷11=0.272727
4÷11=0.363636