已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6e48bcb168d2a66e83f154e1a2e4a6c.png)
更新时间:2019-04-14 23:47:56
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】(1)若
,求
的值.
(2)已知5x+19的立方根是4,2y-3的算术平方根是3,求3x-
y的平方根.
(3)设a、b、c都是实数,且满足
,求式子x
+2x的算术平方根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d95a86965a638d1de0f6d12354fba81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936ba5b0e4998e37db198bb2d067d076.png)
(2)已知5x+19的立方根是4,2y-3的算术平方根是3,求3x-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
(3)设a、b、c都是实数,且满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d2a1c294908710d5798ccfbf915768.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在平面直角坐标系中,已知点
,
,其中
,
满足
,
为第三象限内一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/db6e6952-03c3-4544-a541-752f9c645d8d.png?resizew=177)
(1)若点
的坐标为
,请用含
的式子表示三角形
的面积.
(2)在(1)的条件下,当
时,在
轴上存在一点
,使得三角形
的面积是三角形
面积的2倍,请直接写出点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3160fc73f2a90ae4a1a97351ab2673b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3dd1ffa1d71ff9b4165ab7569a4ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33a945c569a5dc3535a33c516e4bfcd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/20/db6e6952-03c3-4544-a541-752f9c645d8d.png?resizew=177)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e63ad41010cf2624ad390ca2dd0a1fd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3653ada76ba0c8afe9d57c8e7832c6ed.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aed39f5aca78934fb383402433fe549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4d781525777c7b5284dffc70b2a28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3653ada76ba0c8afe9d57c8e7832c6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】理解与思考:整体代换是数学的一种思想方法,例如:
,则
______;我们将
作为一个整体代入,则原式
.
仿照上面的解题方法,完成下面的问题:
(1)若
,则
______;
(2)如果
,求
的值;
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d905b0b228d2ddb95cf128de5002eedc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/472443b4455731d351091dd95e324da3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/749d0e03dc286f2a835768d4ac5f07a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef9789fe7c1111b8a62715bc9db6ae6.png)
仿照上面的解题方法,完成下面的问题:
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99606defee81cacc6652482953b6818c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff789bda494f74ca908864a707bf71a.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ff7e62312dbd1cd5b50a6dc7fdfc166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2841e37e3f02283ca7741839c91bac.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c8d72f8c2de539d25ff156056a301f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/097c03ecc166e43e8d95f8941237438a.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】已知
,求代数式
的值.
解:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0b109e32c0cccc92c942f08801fe2b.png)
(第一步)
(第二步)
(第三步)
由
,得
(第四步)
所以,原式
(第五步)
任务:
(1)该解法运用的主要数学思想是___________.
A.转化思想 B.数形结合思想 C.公理化思想 D.整体思想
(2)该解答过程在第___________步开始出现错误,错误的原因是___________.
(3)请你借鉴该解题方法,写出此题的正确解答过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df38750036e9864e4d21f6d661cae77c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0b109e32c0cccc92c942f08801fe2b.png)
解:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0b109e32c0cccc92c942f08801fe2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e23b5eab0d8d7e4a0ac798352e65b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c82ef8ac4dd2c571190a6c05ca71f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c72109d1a974e7bb8e2be1c1918291e.png)
由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df38750036e9864e4d21f6d661cae77c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f545d563a669494fb6b55b0db74b064.png)
所以,原式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d8e475dc4315fd8febe040c1c42f4f.png)
任务:
(1)该解法运用的主要数学思想是___________.
A.转化思想 B.数形结合思想 C.公理化思想 D.整体思想
(2)该解答过程在第___________步开始出现错误,错误的原因是___________.
(3)请你借鉴该解题方法,写出此题的正确解答过程.
您最近一年使用:0次