计算:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a498e8324fc0759b8e5a0f8b7417623d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf315f973a3f8f0cd0c8c473931d0bc.png)
更新时间:2024-05-26 20:00:38
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】规定两数
,
之间的一种运算,记作
:如果
,那么
.例如:因为
,所以
.
(1)根据上述规定,填空:
______,
______
______;
(2)若
,
,
,试证明
成立.
![](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/4562f3225c98cf5cb11b47d98c9cc9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d74fb8a902e0cbb2a35fc8e364ba069.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5557da9a3fa0e05492df7aaa875171f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feae878a430a1b23774127547d842cb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f65cb415188aa68a3e30b6def86f2d74.png)
(1)根据上述规定,填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af858a0d9d3918ec2653f9da8332ad39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e003e28f934ef5bbf1d4e8734a8b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0892ca8b0100284c6458359933eafb33.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f17bc2a821a22eac911278e2ca29d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c75ad74d602f789a2b8d8a54154474f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/513173b93cc3526d4fe7efc7c7cc1491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4e94d78949138071e0c9994de12c81.png)
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解答题-计算题
|
适中
(0.65)
【推荐2】观察下面三行数
,4,
,16,
,64……
0,6,
,18,
,66……
1,
,4,
,16,
……
(1)第一行第7个数是________,第二行第7个数是________;
(2)第三行的第n(
,n是正整数)个数是________;
(3)取每行的第8个数求和,计算这三个数的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b9a5f1362c12e1ea8f6fc0d9d787ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1dfc770fc27e0b9bf602ec2f842ae9.png)
0,6,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01317332a203c898536b1d0459f51d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f86b86a6ccdf2c077d195db7bc380ea.png)
1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b9a5f1362c12e1ea8f6fc0d9d787ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1dfc770fc27e0b9bf602ec2f842ae9.png)
(1)第一行第7个数是________,第二行第7个数是________;
(2)第三行的第n(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e167b43045b3297248e334c41c621b8f.png)
(3)取每行的第8个数求和,计算这三个数的和.
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解答题-计算题
|
适中
(0.65)
【推荐1】阅读材料并解决问题:
,像上述解题过程中,
与
相乘的积不含二次根式,我们可以将这两个式子称为互为有理化因式,上述解题过程也称为分母有理化.
请仿照上面的方法,解决下列问题:
(1)计算:
,
;
若n为正整数,请你猜想
.
(2)计算:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4da24eff764a962b5ec6a21b08d7c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a581f283460235482116fbe3ba41efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53204688086b1d0111e91cb49fa0ac61.png)
请仿照上面的方法,解决下列问题:
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a84712e61cc6f7fc6bb4e358d274f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d520b19a4762831db9d964e3fd72210e.png)
若n为正整数,请你猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cef1f04f3a901c2e463333eb30efb50.png)
(2)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bced59f3e3b3f9074e10f1fe9df3f3.png)
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解答题-问答题
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名校
【推荐1】阅读材料:把形如
的二次三项式(或其一部分)配成完全平方式的方法叫做配方法,配方法的基本形式是完全平方公式的逆写,即
.例如:将
进行配方,有如下三种形式:
①选择二次项、一次项配方得
;
②选择二次项、常数项配得
或
;
③选一次项、常数项配方得
.
请根据阅读材料解决下列问题:
(1)仿照照上述例子,写出
的三种不同形式的配方结果;
(2)将
配方(至少两种形式);
(3)已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c964e149ebd8bd5b2307f9b9e803caf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5de37d32eccdc451613ef70bf7b21ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef75e7bc2ce5f0e233c01c97c9fad932.png)
①选择二次项、一次项配方得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/343b5cab03c1220255495eed24b1623e.png)
②选择二次项、常数项配得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f86e563be0f3a0362399805160c1db3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a5a21cebf65773e9fb7001b3e42b206.png)
③选一次项、常数项配方得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed92a27d3a08f94a842ff4f84470f5d8.png)
请根据阅读材料解决下列问题:
(1)仿照照上述例子,写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93d05691e6d6ea45fef3e938f76d421.png)
(2)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d032c76687e24548ee2dda65f2b93802.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdeecb1c8194ae306b6d4f0a65fcb981.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae24688d4c45aad43e9af0b7bbfda6b.png)
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解答题-计算题
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适中
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【推荐2】①
②
③x(x+1)-(x-1)(x+1).
④用简便方法计算:20192-2018×2020
⑤先化简,再求值:当x=﹣2,y=3时,求代数式(y+3x)(3x-y)-(3y-x)(3y+x)的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0084e8c2825350b5afcd9ef90f9c42aa.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313a2060873ec40a6bf8570953660c30.png)
③x(x+1)-(x-1)(x+1).
④用简便方法计算:20192-2018×2020
⑤先化简,再求值:当x=﹣2,y=3时,求代数式(y+3x)(3x-y)-(3y-x)(3y+x)的值
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐1】(1)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9263d410b81e480b10e566d6f0fa1a7.png)
(2)先化简,再求值:
,从
中选出合适的x的整数值代入求值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9263d410b81e480b10e566d6f0fa1a7.png)
(2)先化简,再求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b497d00fffc9a8e6967991241a937f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/208e321e1a4a443e103db2482359feae.png)
您最近一年使用:0次