计算:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/863111ae42c5eb78f810ba0245169da2.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630cafed23332114e1c95354d8fdf501.png)
更新时间:2024-01-29 21:45:39
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相似题推荐
解答题-问答题
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适中
(0.65)
【推荐1】我们已经知道一个数的绝对值是表示这个数的点与原点的距离,对一个数a取绝对值也可以看作是一种运算|a|,当a>0时,|a|=a;当a=0时,|a|=0;当a<0时,|a|=﹣a.
类似地,我们规定一种运算sg(a),当a>0时,sg(a)=1;当a=0时,sg(a)=0;当a<0时,sg(a)=﹣1.
例如,sg(+3)=1,sg(﹣5)=﹣1.
(1)填空:sg(﹣32)= ;
(2)如图,数轴上点A、B表示的数分别为﹣2和3,点P在数轴上移动,点P表示的数为x,
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754709624971264/2797360114368512/STEM/58f71399a5374470b922d38dff43306a.png?resizew=328)
①当点P在线段AB上时,
= ;
②
的值是否能等于0,如果能等于0,指出点P在数轴上的位置;如果不能,请说明理由.
类似地,我们规定一种运算sg(a),当a>0时,sg(a)=1;当a=0时,sg(a)=0;当a<0时,sg(a)=﹣1.
例如,sg(+3)=1,sg(﹣5)=﹣1.
(1)填空:sg(﹣32)= ;
(2)如图,数轴上点A、B表示的数分别为﹣2和3,点P在数轴上移动,点P表示的数为x,
![](https://img.xkw.com/dksih/QBM/2021/7/1/2754709624971264/2797360114368512/STEM/58f71399a5374470b922d38dff43306a.png?resizew=328)
①当点P在线段AB上时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd24eba9d7306c83d921673d5d72188.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd24eba9d7306c83d921673d5d72188.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】观察下列算式:
①
=
,
;
②
,
;
③
,
;
……
(1)
等于
吗?请验证.
(2)计算:
.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ed98e34b84285163a8b1b45c6fe403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4a4ef4ac1fd9ce30d168f341ccfa50c.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c543b2d670c3a53efa39f51bdc7ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fdb6a412178d453a438ee11e3c17624.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b110b06dc09e482d3203c1e8d3cec914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb522f72aafe530c970a8038feed4485.png)
……
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a43b7f67537c450907647a1c1a53e18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb838601c2f072875cc272b974fb73.png)
(2)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746b1fdc1d7314d51c60ae65ee62d636.png)
您最近一年使用:0次