计算:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40854ce3ddf6aa72b4bb10ab9e2d3d62.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2e3774e749e37a1b567e6ce735eada.png)
更新时间:2022-07-07 22:44:02
|
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,四边形
是菱形,对角线
、
交于点O,点D、B是对角线
所在直线上两点,且
,连接
、
、
、
,
.
是正方形;
(2)若正方形
的面积为72,
,求点F到线段
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6b9f6a328a61dc76825f1a87812b21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64e0206b1814c35cc96bd2b6b12239a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐2】计算
(1) 22 |
-2|-2cos45º 3 0
(2)先化简,再求值: (1
)
,其中a
-1
(3)
-
+
(1) 22 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(2)先化简,再求值: (1
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2c70fcaa661df4fbcad820b439accda.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ef000895b941bf56731496c395a3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d83883af1551c69a513e24e9389fc049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aea872287a155776bf38d4a4cab7e464.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1411e66402359355af5ef24dde907b08.png)
您最近一年使用:0次