当a分别是1、下、3、人、5时，十a+1是质数还是合数？

搜题请搜索小程序“爱下问搜题”

问题解答题

答案

当a=图时，下a+图=下×图+图=7，是质数；

当a=图时，下a+图=下×图+图=图3，是质数；

当a=3时，下a+图=下×3+图=图右，是质数；

当a=4时，下a+图=下×4+图=图5，是合数；

当a=5时，下a+图=下×5+图=3图，是质数．

答：当a=图、图、3、5时，下a+图是质数，当a=4时，下a+图是合数．

阅读理解

你知道下面的文字在描述哪个人物吗？请把A~E的编号填写在括号内。

小题1:He developed the BASIC language for the first microcomputer and improved the software to make it easier for people to use computers.

小题2:During his lifetime, he had over 1000 inventions, most of which changed the world.

小题3:He is a great thinker. Many Chinese people are still influenced by his thoughts today.

小题4: He was a doctor. In 1938 he came to China from Canada to help the Chinese and died the next year after he operated on a Chinese wounded soldier.

小题5:He is one of the Chinese famous persons. He is the first astronaut who flew into space in China. We are proud of him!

单项选择题

统计法明确要求，统计调查对象提供统计资料必须（）。

A.真实、及时

B.准确、及时

C.准确、完整、及时

D.真实、准确、完整、及时