有理数a、b在数轴上如图所示,则化简
的结果是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6167c7d096822310b9aef5740644de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/20/e670af2e-2a85-4367-a11b-3a68c9824b54.png?resizew=180)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2023-11-20 21:03:30
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【推荐1】如图,数轴上对应点A、B分别表示有理数a,b,则下列结论中正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/12/6/2349159783022592/2349280844963840/STEM/d6494719fbe3460d9f2bc85d23562f6c.png?resizew=188)
![](https://img.xkw.com/dksih/QBM/2019/12/6/2349159783022592/2349280844963840/STEM/d6494719fbe3460d9f2bc85d23562f6c.png?resizew=188)
A.|a|>|b| | B.a2﹣b2<0 | C.a﹣b<0 | D.ab>0 |
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【推荐2】有理数
在数轴上的位置如图所示,则化简代数式
的结果是( )
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694767167102976/2694848801136640/STEM/19f47234-af0e-47e0-81c8-4b2c9cb3e973.png?resizew=236)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b06e22c87f4a6778c666b46d9f784c04.png)
![](https://img.xkw.com/dksih/QBM/2021/4/7/2694767167102976/2694848801136640/STEM/19f47234-af0e-47e0-81c8-4b2c9cb3e973.png?resizew=236)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】下列各组数中,不相等的一组数是( )
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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【推荐1】小明在计算
时,他发现解题时利用了多个运算律,那么他没有用到的运算律是( )
解:原式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1537c7b6aaaeb5bf9c9595bd602063c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16810c7e88e03c9a8b5ef988187874b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e3f0932deefa02aa207b78dc2f96bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7104a57ab51efabbfb7200463415bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768f618e9f9afbd6a6e6fc71a6acb149.png)
解:原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1537c7b6aaaeb5bf9c9595bd602063c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16810c7e88e03c9a8b5ef988187874b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11e3f0932deefa02aa207b78dc2f96bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7104a57ab51efabbfb7200463415bfd.png)
A.加法交换律 | B.乘法交换律 | C.加法结合律 | D.乘法分配律 |
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【推荐2】实数a,b,c在数轴上的对应点如图所示,化简
的结果是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3571747eb5e4854e7762abbfe459b4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/8/9846ad8f-18d2-48b3-bc12-adde04ac394b.png?resizew=266)
A.![]() | B.![]() | C.![]() | D.![]() |
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