Question

若甲數(shù)的小數(shù)點左移8位，等于乙數(shù)的小數(shù)點右移3位；乙數(shù)的小數(shù)點左移2位，等于丙數(shù)的小數(shù)點右移2位，則甲數(shù)是丙數(shù)的（　�。┍叮�

• A、10¹⁰
• B、10¹⁵
• C、10
• D、

  1

  1010

Answer 1

分析：根據(jù)甲數(shù)的小數(shù)點左移8位，等于乙數(shù)的小數(shù)點右移3位求出甲乙兩數(shù)之間的關(guān)系，再根據(jù)乙數(shù)的小數(shù)點左移2位，等于丙數(shù)的小數(shù)點右移2位求出乙丙兩數(shù)之間的關(guān)系即可解答．

解答：解：∵甲數(shù)的小數(shù)點左移8位，等于乙數(shù)的小數(shù)點右移3位，
∴甲數(shù)是乙數(shù)的10¹¹倍，
又∵乙數(shù)的小數(shù)點左移2位，等于丙數(shù)的小數(shù)點右移2位
∴乙數(shù)是丙數(shù)的10⁴倍，
∴甲數(shù)是丙數(shù)的10¹⁵倍．
故選B．

點評：本題主要考查有理數(shù)無理數(shù)的概念與運算，數(shù)量掌握小數(shù)點的移動規(guī)律是解答本題的關(guān)鍵．