计算⑴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd4ac4526e3f4c645a9370db17a6026e.png)
______ ,⑵
的倒数是______ ,⑶
的相反数是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd4ac4526e3f4c645a9370db17a6026e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eab83eb2330c9b92023eb68c1756db3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af1aba375eabe0a235783e65bf04d57.png)
更新时间:2019-12-12 13:40:10
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【推荐1】以下说法正确的是:_____ .
①由ab>bc,得a>c;②由ab2>cb2,得a>c;③由b﹣a<b﹣c,得a>c;④由a>b,得ac2>bc2;⑤﹣an和(﹣a)n互为相反数;⑥x>3是不等式x+2>1的解.
①由ab>bc,得a>c;②由ab2>cb2,得a>c;③由b﹣a<b﹣c,得a>c;④由a>b,得ac2>bc2;⑤﹣an和(﹣a)n互为相反数;⑥x>3是不等式x+2>1的解.
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【推荐2】对于有理数a,b有下列几种说法,其中正确的个数有____________ 个
①
;
②若
,则a与b互为相反数;
③若
,则a与b异号;
④若
,且a与b同号时,则
,
;
⑤若
,且a与b异号,则
;
⑥
,则
.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/970146f8c437d6e97a9ca4d8c6c3a8a8.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd9cdea1e995c59e5d3225acad8b4d3c.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd039882414ced3cd59d7a4d5ec76f35.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ecda7bfb0a2043306bf7707a136ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
⑤若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850f6874ea501c6021573701b0294dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ecda7bfb0a2043306bf7707a136ad0.png)
⑥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269bc992dccb16d432e51ed2c01aa2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ecda7bfb0a2043306bf7707a136ad0.png)
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名校
【推荐1】下列说法中:
①若
,则
;
②若
,则
一定是关于x的方程
的解;
③若
,且
,则
;
④若
,则
;
其中正确的是____________ .
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af69c770e8ffdeb57f70a90711617a2.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799e8ae2779e6b0f2def1e4499ba8f2a.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e96f2368d04db6d0e05de46e97e29f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c21bd0bd90a89b7ff5ac0eacf612a5.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e56f4504e0f80fd031c8b5f41832e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3252d4ed9d8e0ad920bce5ec7ebc201b.png)
其中正确的是
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【推荐2】已知
、
、
三个数在数轴上对应的位置如图所示,下列判断中正确的序号有______ .
;
;
;
;
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/238b0bdd3afab8fce6e40c7da1548936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111b04e5656f89c906c0e76f4f234248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea120e6a117aa8d412ae0c6c8fc4f284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4c6f3529779d0b92926ec5050a005f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/287cf9a693f75303486019ac2a3beea3.png)
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【推荐2】善于反思的小聪在学习了有理数及其运算后,进行了如下总结与反思请你仔细阅读并补全小聪的探究过程.
[典例再现]|3|=3,|﹣3|=3,22=4,(﹣2)2=4;
[总结归纳]
(1)观察上述例题,发现结论:
①互为相反数的两个数的绝对值 ;
② ;
[知识应用]
(2)已知|x|=7,y2=9,则x= ,y= ,若x<y,则x﹣y= .
[典例再现]|3|=3,|﹣3|=3,22=4,(﹣2)2=4;
[总结归纳]
(1)观察上述例题,发现结论:
①互为相反数的两个数的绝对值 ;
② ;
[知识应用]
(2)已知|x|=7,y2=9,则x= ,y= ,若x<y,则x﹣y= .
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【推荐1】若|3b-1|+(a+3)2=0,则a-b的倒数是______ .
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【推荐2】________ 的倒数等于本身;
的倒数为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f0232cc26735f8941a5ed07f5f6c185.png)
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