1 . 下列各式:①
;②
;③
;④
;⑤
,其中计算正确的个数有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111848feaac6190bc8d4f98c56aaa93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19085f2f3fa5264f5ec1a9fcf7e30330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba92522ec440429bc91ed5a359a9f8c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff58e47500ee4ed5b74453118d94980.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c256c5c9e5b75bb4025d3cad9145183.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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2 . 已知
是二次函数
图象上的一系列点,其中
,记
(n为正整数),令
,则S的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb1b052b4fbeab908e1e3d4a2903f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5109eb35b9c16fc5e128198a1819a44c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4f74cba0f2dcda7e483808b7aaaabb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c414502a9d5420715cb39e6fc2d64c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeaeefb8d052ab78155b326f7392555d.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 若三个方程的正根分别记为
,则下列判断正确的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 已知点
,
,
均在抛物线
上,下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c5d57111dd825830d87e5a8ba28cf9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5e695fbbd1a4c076757c2172e9ff5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213632685641d1d75ce7e827db800b26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68846e796086eeff26e70135fdff94fb.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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5 . 已知
,
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/909aed03a34ab0e77ee7a405d77c9834.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca0bb465e4fbaa41f973c55af3edc016.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 已知一元二次方程
的两根
、
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b0b55c3297ce66c96d1559d76971f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3000d101d000defcd047c09772e68b14.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 若
,则
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b43498cdea91037bd093c1100af4f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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8 . 把
分解因式的结果是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a29e54ba76149d87d5891156e34b76ab.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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9 . 用配方法解方程
,配方后可得( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d4f63e3c9135e38b58f42e21be0387.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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10 . 用公式法解方程
,正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da95b31f987cb51715118abd63443a5b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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