先化简,再求值:
(1)
,其中x=
;
(2)
÷
+
,其中a=
+1.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/391427170cb4c405b8e375eeeded7e04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e754b8211d5132ae18d3eb681cfc1713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76adc2b77ccec952aa12782fdb6e9e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1255cd514c1c9e60e75763859aad2a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
更新时间:2018-08-28 12:41:54
|
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解答题-计算题
|
适中
(0.65)
【推荐2】(1)计算:(
)–3+|
–2|–(–2019)0.
(2)先化简,再求值:已知:(
+1)÷(x+
),其中x=4–2sin30°.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)先化简,再求值:已知:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ebfca5d354cde868ef6477d499263b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ebfca5d354cde868ef6477d499263b3.png)
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