1 . 阅读材料解答下列问题
观察下列方程:①
,②
,③
……
⑴按此规律写出关于x的第n个方程为____________________,此方程的解为____________.
⑵根据上述结论,求出
的解.
观察下列方程:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39c4b0dcc92530e98a4674e3ccabc012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5db2c25dda4a73b5528d9f54d5601523.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a33501b6617902f482f5c40b217b5c1.png)
⑴按此规律写出关于x的第n个方程为____________________,此方程的解为____________.
⑵根据上述结论,求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5e8839a26848de8c186acd67416418.png)
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2 . 已知:①x+
=3可转化为x+
=1+2,解得x1=1,x2=2,
②x+
=5可转化为x+
=2+3,解得x1=2,x2=3,
③x+
=7可转化为x+
=3+4,解得x1=3,x2=4,……
根据以上规律,关于x的方程x+
=2n+4的解为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c943d7b6ce65c70e98d62e3664168ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf63357350084231daa3b4fc5918312d.png)
②x+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168e61741a49e507fce9a9694ef31a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f814cb239d5ab7128b2c28cbde3109.png)
③x+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6e27795db2c7c758ef37d29dac96f06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91d95a7704cae54a19dbb7c22bdaedda.png)
根据以上规律,关于x的方程x+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6a0e09c11af69ab5234a7394ccc84d.png)
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2019-05-19更新
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669次组卷
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4卷引用:【校级联考】山东省日照市莒县2018届中考一模数学试题
3 . 观察下列等式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403e2785503994e6a7856480eba58860.png)
将以上二个等式两边分别相加得:
用你发现的规律解答下列问题:
(1)直接写出下列各式的计算结果:
①
;
②
;
(2)仿照题中的计算形式,猜想并写出:
的值;
(3)解方程:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/403e2785503994e6a7856480eba58860.png)
将以上二个等式两边分别相加得:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b9ebd02cc7b8e8a52ef0ff9a88b454e.png)
用你发现的规律解答下列问题:
(1)直接写出下列各式的计算结果:
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c27b43495c90010f623a5d84d6bb49c.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7a1b14b3f137962074f8af50aceb00.png)
(2)仿照题中的计算形式,猜想并写出:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5539c188dcd6c4e539699262892c2d3d.png)
(3)解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f65000b8394e87a876619e83744749.png)
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4 . 先观察下列等式,然后用你发现的规律(n≥1且n为整数)解答下列问题:
,
,
,……
(1)计算:
= ;
(2)若
的值为
,求n的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c886f7f64f1ecd9df68d9e766f7d83c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82d9d2a8630df3f505d6a9246802e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf2de1bfc8ec438d1e6ea7af508fc12.png)
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb902fa5642baac4e45876c5d197eba.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2a77ce2855ad8b3cb5a405bf6357add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786a4757a4b9154deb98180c5f1f82a7.png)
您最近一年使用:0次
2018-06-23更新
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154次组卷
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2卷引用:云南省红河州蒙自市2018年初中学业水平模拟考试(二)数学