下列各式中运算正确的是 ( )
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2019-12-11 15:45:39
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【推荐1】有理数a,b在数轴上的位置如图所示,则下列各式的值为负的是( )
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594276502470656/2597098328760320/STEM/1cf8699c422f4c64af06ec42879ad1ed.png?resizew=237)
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594276502470656/2597098328760320/STEM/1cf8699c422f4c64af06ec42879ad1ed.png?resizew=237)
A.![]() | B.![]() |
C.![]() | D.![]() |
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单选题
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较易
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【推荐2】观察等式:1+2+2
=2
-1;1+2+2
+2
=2
-1;1+2+2
+2
+2
=2
-1;若 1+2+2
+…+2
=2
-1=m,则用含 m 的式子表示 2
+2
+ …+2
+2
的结果是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708845c377fa64e861e262aedce18319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708845c377fa64e861e262aedce18319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344cd379972b48f34e20ada632889309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708845c377fa64e861e262aedce18319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344cd379972b48f34e20ada632889309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aa896c0430b7c86e7ee96a8dbd8f445.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15d8f608a12aed04ad2912b91e398b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db29c4e39469f7e3fc5af7864ef8a998.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6afb2bacfb6b6000a1101bf30a4381a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f04b94ea06176406a74ccc1b4d14bf10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbaf35a5542e4b8953d5d5ef0961ebf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3280ef9e6a0f9e5b1b4e66468a00bf4.png)
A.m![]() | B.m![]() | C.m![]() | D.m![]() |
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