阅读下面的材料,回答问题:
(1)将关于x的一元二次方程
变形为
,就可以将
表示为关于
的一次多项式,从而达到“降次”的目的,我们称这样的方法为“降次法”.
已知
,用“降次法”求出
的值是 .
(2)解方程
,这是一个一元四次方程,根据该方程的特点,它的解法通常是:设
,那么
,于是原方程可变为
(1),解得
,
.
当
时,
,
;
当
时,
,
;
原方程有四个根:
,
,
,
.
请你用(2)中的方法求出方程
的实数解.
(1)将关于x的一元二次方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b800b7d6a688abf8a3018c133cec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87136069b89a453904902564c609d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4cdd6f27334444c1884876b9e4cfe6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aed50f91df3d3098ac2cbae361f147c4.png)
(2)解方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c72471f5a6c0af3abace8d56ac4413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ad7c068b9b7c0fd764cf7746407079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b02034e1538d11e67f0caecf8ed9dbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d508887ede441f4d498565ceeb8682a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda6ab0f37a6a39baffa6c98dc11dc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb68f02e333c48c66a2656d5115cf46.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6987e8abfbf07d6a2650483d2a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35870839d6109f6ef48fa46339f4019.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de72a5190834f5dbe895596656c038b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2053e1f50472a9fed67d4c84d9cb938.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54123f317e659be64dfdb3ef0599e283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87a60302649eb940748da818199e55da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac12f90931435d60f4b6879ab26f7a0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8079c5a2d8674d322f7abe6d4ef4a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004f34b3d5e0df13fd0e116861d73495.png)
请你用(2)中的方法求出方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b4105f661d045ffbf7eafec82135df.png)
更新时间:2023-10-13 22:00:38
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相似题推荐
解答题-问答题
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适中
(0.65)
【推荐1】已知
,
.
(1)求A和B;
(2)若x,y满足
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/131bfa47828284c18de5cd9bffde0cb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab84c0531ed9fafbe9297374b6ab374e.png)
(1)求A和B;
(2)若x,y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc87ab4dbfdd85d997b2e28b0d789e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17adeeb0a2f6a0322f89aa7e36e30f99.png)
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适中
(0.65)
【推荐2】(1)已知x+y=3,xy=2.求
、
的值;
(2)已知x+2y=3,xy=1.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ebc856291255f2d4a6c20b982a2442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc5f85f56005d1828a804d397e129db.png)
(2)已知x+2y=3,xy=1.求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0428d81bae72991b50cb3982040e7bf.png)
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解答题-问答题
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适中
(0.65)
【推荐1】阅读材料:解方程
,我们可以将
视为一个整体,然后设
,则
,原方程化为
,解得
,
.
当
时,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76af3c07409e8d7907bbe84156d8e4c.png)
当
时,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec73e76ff893b7b25a2f954757dbf76.png)
原方程的解为
,
,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c6765d414b74c91d0ad0f06db034a3.png)
根据上面的解答,解决下面的问题:
(1)填空:在由原方程得到方程①的过程中,利用________法达到降次的目的,体现了________的数学思想;
(2)解方程
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac22e4c7b6910d461fe874a4825af1a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0d30c29fd988b1126bbd88b5ebf29b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e04c5453a56b36ace6b9606fc5fa2ae0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63ca2486f85a90176e0591c06ce1e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d508887ede441f4d498565ceeb8682a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cda6ab0f37a6a39baffa6c98dc11dc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb68f02e333c48c66a2656d5115cf46.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c50866229ec5a3640fb250f9bd2192b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbce8eb03871d4563436ddd3c2eb1808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2607f60f096a69ad082748b8599f7e39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76af3c07409e8d7907bbe84156d8e4c.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de72a5190834f5dbe895596656c038b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f227df33998c627b586997a32d8f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb571d0bafa48edd17eb9c0fd71fe897.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ec73e76ff893b7b25a2f954757dbf76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e370d4caeeab628e65b82b0104114aad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8e9eb18f22ed5b7927a0d0bfa988bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42cb565d4ee7a36e30865423e8524558.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1c6765d414b74c91d0ad0f06db034a3.png)
根据上面的解答,解决下面的问题:
(1)填空:在由原方程得到方程①的过程中,利用________法达到降次的目的,体现了________的数学思想;
(2)解方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f619bc08a827bc5b9a19761efbf49d87.png)
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解答题-问答题
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适中
(0.65)
【推荐2】关于
的方程
,其中
是实数.
若方程没有实数根,求
的范围;
若
,问
为何值时,方程有两个相等的实数根?并求出这两个根.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87f678122c2a39133acd124577250213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47968de4a67d1083d36c173b3d3c2ba9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
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