计算:
(1)
.
(2)
.
(3)
.
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63698b370bce85fc917144408cefd3c9.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1808dba6f97e7a8f7f70fa94cccfa141.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aded12b163b8df1b623046e4a2d4d2f3.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79eb918652b132ca4849502496809979.png)
更新时间:2024-04-25 08:35:35
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相似题推荐
解答题-计算题
|
适中
(0.65)
【推荐1】阅读材料:像
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6dc5d0d90731f7b673ce138a52a179.png)
,……,这种两个含二次根式的代数式相乘,积不含二次根式,我们称这两个代数式互为有理化因式.例如:
与
,
与
,
与
等都是互为有理化因式,在进行二次根式计算时,利用有理化因式,可以化去分母中的根号.
例如:
;
.
解答下列问题:
(1)
与______互为有理化因式,将
分母有理化得______,将
分母有理化得______.
(2)观察下面的变形规律并解决问题.
①
,
,
,…,若n为正整数,请你猜想:
_____.
②计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d1ab47c97e7076d971e14914d8a6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc8b53dc29f3e6fd05c2a7843aa00f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c6dc5d0d90731f7b673ce138a52a179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f3fb1fc32fade98aee7ebf75080b98d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f190b17530d81d927c358ac84757a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34e01955f8c8fe2f0041b35d8d602a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c29a3e8e0a793b8ae0895e47a87b0627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d651a249d8ee81dc6e9070791156da4.png)
例如:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18155b34609b4836e0344de16c886ea2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fbd2c81bb306bdb48387e5565782ef.png)
解答下列问题:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e9d47364540c8fed3ae04a63a71504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e125ce5d2810b0ec1c42bd34ea0b20ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a91c33ebbacfc3e46515737af771e9c.png)
(2)观察下面的变形规律并解决问题.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f46d2748c9411018b3bb2134cbd662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca84e2db65efe3647aba894f55071678.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53b76a425906a6acab27fbd1b3a06173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cef1f04f3a901c2e463333eb30efb50.png)
②计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfe741bb1af59325e5b3a26f491345e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】观察下列算式:
,
,
,
,
…
(1)请写出第5个与上述算式有相同规律的算式:______;
(2)用字母n(n是正整数)写出上述算式反映的规律,并说明结论的正确性.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51bb2ccc517925bcbbab14abed1c70b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92adf13cc2f9ecc1a56ee256a929b26e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1e2df494fd7f2efb0c9b1eaa1d8e235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/504dbabab376f53e24499cfd2fdbcd83.png)
…
(1)请写出第5个与上述算式有相同规律的算式:______;
(2)用字母n(n是正整数)写出上述算式反映的规律,并说明结论的正确性.
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
【推荐1】计算或解方程:
(1)计算:(
﹣1)0+(﹣
)﹣1﹣2cos30°+
;
(2)解方程:7x(5x+2)=6(5x+2).
(1)计算:(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/744bc0dc861cef0a1d10372cf3f20e67.png)
(2)解方程:7x(5x+2)=6(5x+2).
您最近一年使用:0次