(1)阅读下文,寻找规律:
已知 x≠1 时,(1-x)(1+x)=1-x
,
(1-x)(1+x+x
)=1-x
,
(1-x)(1+x+x
+x
)=1-x
.…
观察上式,并猜想:
(1-x)(1+x+x
+ x
+x
)= ____________. (1-x)(1+x+x
+…+x
)= ____________.
(2) 通过以上规律,请你进行下面的探索:
①(a-b)(a+b)= ____________.
②(a-b)(a
+ab+b
)= ____________.
③(a-b)(a
+a
+ab
+b
)= ____________.
(3) 根据你的猜想,计算:
1+2+2
+…+2
+2
+2
已知 x≠1 时,(1-x)(1+x)=1-x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
(1-x)(1+x+x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708845c377fa64e861e262aedce18319.png)
(1-x)(1+x+x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708845c377fa64e861e262aedce18319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344cd379972b48f34e20ada632889309.png)
观察上式,并猜想:
(1-x)(1+x+x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708845c377fa64e861e262aedce18319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/344cd379972b48f34e20ada632889309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ecc4d139c957ffb380e06ede25a774.png)
(2) 通过以上规律,请你进行下面的探索:
①(a-b)(a+b)= ____________.
②(a-b)(a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
③(a-b)(a
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708845c377fa64e861e262aedce18319.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d22d9a2d12d7238f8f560003fd0f50e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708845c377fa64e861e262aedce18319.png)
(3) 根据你的猜想,计算:
1+2+2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a535fac91191415271548e3890111cfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db1eeb85d82814b2bcfbec89cd6bf84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/420b96104448b8a04fd49113502084f8.png)
更新时间:2019-07-12 11:59:11
|
【知识点】 因式分解的应用
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解答题-问答题
|
适中
(0.65)
【推荐1】已知三个实数a、b与c,
.
(1)请判断M与N的大小,并说明理由;
(2)请根据(1)的结论,求
的最小值(其中x,y均为正数),并说明理由;
(3)请判断
的符号(其中a,b,c为互不相等的实数)并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e3a9371a095e1145d8b2f4d3bc41a9.png)
(1)请判断M与N的大小,并说明理由;
(2)请根据(1)的结论,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e228945bcba49e31b06442dca2c19288.png)
(3)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629abc79d5be8093ee40ef9f6eb19337.png)
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