若a、b互为相反数,c、d互为倒数,
的绝对值是2020,求代数式
-1的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4d0b28b6bf0d4cbb85c86a47ec0650.png)
20-21七年级上·湖北黄冈·阶段练习 查看更多[2]
更新时间:2021-01-04 08:12:44
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【知识点】 已知式子的值,求代数式的值解读
相似题推荐
解答题-计算题
|
适中
(0.65)
【推荐1】定义:对于一个有理数x,我们把“
”称作x的对称数.若
,则
;若
,则
.例如:
,
.
(1)填空:
①
;
;
;
②若
,且
,则
.
(2)已知有理数a,b,当
时,满足
,试求代数式
的值.
(3)解方程:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ab85825d4a002600ca41bd3cd2ee7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfd5b849801fde7c8bb0c3b0c10ee5ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/197abb6bcc0d765c8a6c5876c9b8ddd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90ac4e2662d4667596f1968e2a08f0f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9bf352a411af574b7fb5909bac47c5.png)
(1)填空:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b7404125582b5c2a00466b648f461a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b14b9fff2916c8364b4a3178e875f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505d750bb1b29f7fa2b895418a1080d2.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42f0956de3b4f4ea359974dfa400350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(2)已知有理数a,b,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90e8d5d7fed033f48270b1ff825fcd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa15872531dd3b56b8038634b9ab459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f11ce9194a3a8ca5f77f32b564459d4d.png)
(3)解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc63f78fe0ec76112469b1bd0a16f683.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】我们规定一种新定义:
,其中符号“※”是我们规定的一种新定 义,如
.
(1)根据新定义计算:
;
(2)已知
,求b的值.
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c9f60792da960542e0f146deb1c9857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8484c3f4bfccc988304498475a84c1bc.png)
(1)根据新定义计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a629cbc52ad93aa697fedad52814f127.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05a8c5cdc1bf4e7692a8986e8b58d1db.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d534e3c13cdd68bb85779461968ef2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8320960b778c31e82c72a82aaeaaba.png)
您最近一年使用:0次