计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a2b647a91c61402b1896fdf636edac.png)
(2)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39a2b647a91c61402b1896fdf636edac.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085b6bcf62bf87bfe32baf3c27f6681e.png)
更新时间:2019-11-07 15:23:26
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相似题推荐
解答题-计算题
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适中
(0.65)
名校
【推荐1】在有些情况下,不需要计算出结果也能把绝对值符号去掉,例如:
;
;
;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e34c485a83e56b106d4d00ffafd32c.png)
根据上面的规律,把(1)(2)(3)中的式子写成去掉绝对值符号的形式,并计算第(4)题.
(1)
;
(2)
;
(3)
;
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c80dc08683dba6ca0f17023736fef437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80d6baf018fe1f41ce829a1c2b9eb723.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48643eb0c4dfe478bbcfc98ef177d670.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e34c485a83e56b106d4d00ffafd32c.png)
根据上面的规律,把(1)(2)(3)中的式子写成去掉绝对值符号的形式,并计算第(4)题.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9c31c0736fd84ae5f64b325c25d6ae.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a551afd9fd8891f91bc7e382f8dc75cb.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87274267ac203abd9aaac72d5c0bf1bc.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91dc07eb4aa4ed7d47db16234594e992.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐3】小雅对有理数a,b定义了一种新的运算,叫做“乘减法”,记作“
”.他写出了一些按照“乘减法”运算的算式:
,
,
,
,
,
,
,
,
,
.
(1)请你根据以上算式将“乘减法”法则补充完整:绝对值不相等的两数相“乘减”,同号得 ,异号得 ,并用较大的绝对值 (填“加上”或“减去”) 较小的绝对值;绝对值相等的两数相“乘减”,都得0;一个数与0相“乘减”,或0与一个数相“乘减”,都得 .(填“这个数本身”或“这个数的绝对值”)
(2)若括号的作用与它在有理数运算中的作用相同,
①用“乘减法”计算:
;
②小雅发现交换律在有理数的“乘减法”中仍然成立,即
.请你探究结合律在有理数的“乘减法”中是否成立?若成立,请说明理由;若不成立,请以
,
,
为例说明
不成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/958bd270a90b9fbe73d2951b97a2d3ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50427def1b6748f8812bef47d4993de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d04509949a9d9b7bf996f31667578fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7450554753db78dff5551f07e3d776f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6624a60c12244d3494108806a777297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be27ed8982c3fa9494335899c9a8250c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c8652b71f1b3e15fd8cf562f27a251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faa2ae4a1abec8fe6d9982e5034677a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0df9dfccd2a9972ba8ed81143e6f956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4203dcdc24ff917d80c895e0eb700a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/949488e7e88fbecb640f97f6ad4af310.png)
(1)请你根据以上算式将“乘减法”法则补充完整:绝对值不相等的两数相“乘减”,同号得 ,异号得 ,并用较大的绝对值 (填“加上”或“减去”) 较小的绝对值;绝对值相等的两数相“乘减”,都得0;一个数与0相“乘减”,或0与一个数相“乘减”,都得 .(填“这个数本身”或“这个数的绝对值”)
(2)若括号的作用与它在有理数运算中的作用相同,
①用“乘减法”计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be12c7eaf78b37f2292c935a88fc45b.png)
②小雅发现交换律在有理数的“乘减法”中仍然成立,即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7ff4ffa27279dbf509cfb852446813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce4430b8b9b0c78de693513a7f88915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc28004ff32de5b6717fbaa4b10e52d9.png)
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