题目内容
若a为有理数,下列式子中一定是负数的是
[ ]
A.-![](http://thumb.1010pic.com/pic7/pages/3003/0122/0053/6b670b7d1f294d68f49a008c804a3ec9/A/Image13442.gif)
![](http://thumb.1010pic.com/pic7/pages/3003/0122/0053/6b670b7d1f294d68f49a008c804a3ec9/A/Image13442.gif)
B.-![](http://thumb.1010pic.com/pic7/pages/3003/0122/0053/6b670b7d1f294d68f49a008c804a3ec9/A/Image13443.gif)
![](http://thumb.1010pic.com/pic7/pages/3003/0122/0053/6b670b7d1f294d68f49a008c804a3ec9/A/Image13443.gif)
C.-![](http://thumb.1010pic.com/pic7/pages/3003/0122/0053/6b670b7d1f294d68f49a008c804a3ec9/A/Image13444.gif)
![](http://thumb.1010pic.com/pic7/pages/3003/0122/0053/6b670b7d1f294d68f49a008c804a3ec9/A/Image13444.gif)
D.-(
+1)
![](http://thumb.1010pic.com/pic7/pages/3003/0122/0053/6b670b7d1f294d68f49a008c804a3ec9/A/Image13445.gif)
答案:D
![](http://thumb2018.1010pic.com/images/loading.gif)
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探索性问题
已知A,B在数轴上分别表示a、b.
利用数形结合思想回答下列问题:
(1)填写下表:
数 | 列A | 列B | 列C | 列D | 列E | 列F |
a | 5 | -5 | -6 | -6 | -10 | -2.5 |
b | 3 | 0 | 4 | -4 | 2 | -2.5 |
A,B两点的距离 |
(3)若x表示一个有理数,且-3<x<1,则|x-1|+|x+3|=______.
(4)若A,B两点的距离为d,则d与a、b有何数量关系.