计算:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fb4254beba29b2fde8faac223c9165.png)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c760a9b64048294c8a9505d543f311.png)
(3)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f99805788ecb7ab68810c162f7705eb.png)
(4)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fb4254beba29b2fde8faac223c9165.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c760a9b64048294c8a9505d543f311.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f99805788ecb7ab68810c162f7705eb.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33ab228107f7bbe829aff863d26172a.png)
21-22八年级下·贵州黔西·阶段练习 查看更多[2]
更新时间:2022-09-11 17:59:45
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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】(1)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf978d5ff676498ffe2889a5e41eba2.png)
(2)如图,在
中,
,D、E、F分别是
、
、
的中点连接
、
,求证:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf978d5ff676498ffe2889a5e41eba2.png)
(2)如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d92ae441a3776a921b4e1b51ec09e0.png)
您最近一年使用:0次
解答题-计算题
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适中
(0.65)
【推荐2】(1)计算:(1-π)0×
-(-
)-1+︱-2︱
(2)先化简,再求值:(
-
)÷
,其中x=-3.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8397629ac2094389cd991491413535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
(2)先化简,再求值:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881e00903d3fdd3813f4fe35a3a90e86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ebfca5d354cde868ef6477d499263b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a5a1155f88039a50565f4e04ee9bff9.png)
您最近一年使用:0次
解答题-问答题
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【推荐2】阅读与思考
请阅读下列材料,并完成下列任务.
任务:
(1)对于函数
,当
等于___________时,函数
有最___________值(填“大”或“小”),这个值是___________;
(2)对于函数
,当
等于___________时,函数
有最___________值,这个最值是___________;
(3)某植物园利用一面足够长的围墙和木栏围成一个矩形花圃,中间用一排木栏隔开,如图所示,总共用了100米的木栏,当
长为多少时,矩形花圃
的面积最大?最大面积是多少?请你利用材料中的结论或所学知识求解该问题.
请阅读下列材料,并完成下列任务.
问题背景: 数学兴趣小组的同学们在学习了完全平方公式之后,发现由于 ![]() ![]() 探索发现: ![]() ![]() ![]() ![]() ![]() 发现结论:如果 ![]() ![]() ![]() 解释证明: 当 ![]() ![]() ![]() ![]() 当 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
(1)对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9a70fee672088fd1d95755ffd0b504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)对于函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee0d797423083236239a6c97c0f49ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(3)某植物园利用一面足够长的围墙和木栏围成一个矩形花圃,中间用一排木栏隔开,如图所示,总共用了100米的木栏,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-计算题
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【推荐1】我们知道:
,这一化简变形过程叫做分母有理化,类似地:
,
式子
也可以这样化简:
,这样化简变形也是分母有理化.
利用以上信息解答下列问题:
(1)直接写出化简结果:
=___,
=___;
(2)用两种不同的方法化简:
;
(3)化简:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e13086a7dd306655c58926773a80a60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22d77f5f088d99987e8755e490be412c.png)
式子
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6d7b69b454f0a51548dd8a3482174a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9e515ad2d1c88f318debe6a75c296b.png)
利用以上信息解答下列问题:
(1)直接写出化简结果:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b846b5b90861768dead280f54018285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d46d903100e4258ef742d56efdeeb156.png)
(2)用两种不同的方法化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/874e4d66bf4c98776f39d077699ca994.png)
(3)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d3e0286ea0d989b0e2fb94bca4ae4d.png)
您最近一年使用:0次