1 . 已知实数a、b满足
,若关于x的一元二次方程
的两个实数根分别为
、
,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0101fc653ba365879b2cbdf8ab70d8c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74457dc76d16897775a5021da7e3a3a8.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/20fef976a0230bdfe3bc758e93987ba8.png)
A.![]() | B.![]() | C.![]() | D.2 |
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2 . 如图,在
中,
,以点A为圆心,任意长为半径画弧分别交AB,AC于点M和N,再分别以M,N为圆心,大于
的长为半径画弧,两弧交于点B连接AP并延长交BC于点D,则下列结论不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/88f3aadd-a90f-4193-a563-28824d2dcd3e.png?resizew=160)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abbe207407b14cfea2662d9c51029110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94e1ca12da27075e5241b7c7ce74672.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/88f3aadd-a90f-4193-a563-28824d2dcd3e.png?resizew=160)
A.AD平分![]() | B.![]() |
C.点D在AB的垂直平分线上 | D.![]() |
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3 . 若a,b是正数,且满足
,则a和b之间的大小关系是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c4aee30e200f9fb1f63a80b0092474.png)
A.![]() | B.![]() | C.![]() | D.不能确定 |
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4 . 代数式
的最小值是()
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf3ef8bd57b7d85bec23959b007794e.png)
A.9 | B.10 | C.17 | D.19 |
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5 . 如下图所示,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172b54d5833f597087dd240fcc4e5b95.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/c55cf609-088b-4e6f-bd26-0d97c1177960.png?resizew=161)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 勾股定理是人类耻伟大的科学发现之一,在我国古算书《周髀算经》中早有记载.如图1,在
中,
,以
的各边为边分别向外作正方形,再将较小的两个正方形按图2所示放置,连结MG,DC.若
,且
,则AB的长为()
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/1531a296-a9e9-42b0-8ce8-3e9ea944a005.png?resizew=293)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea86458ea28ef2799c6be99181a2c62e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00db6c68c62d042f63660b6139e856bf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/28/1531a296-a9e9-42b0-8ce8-3e9ea944a005.png?resizew=293)
A.![]() | B.![]() | C.![]() | D.![]() |
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7 . 我们知道二元一次方程组
解是
,给出另一个二元一次方程组
的解是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a6e0b4cd676e1dfa2af20ebb55c0ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5ffa7d767f601d0a064b412648593c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20f19f4a6edfacff28e9e383602042fd.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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8 . 如图为一节楼梯的示意图,
米.现要在楼梯上铺一块地毯,楼梯宽度AD为1米,则地毯的面积至少需要( )平方米.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/6489b694-ce4d-4814-8b05-04d09176e20b.png?resizew=159)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a908a4e1eec10e0af09c6ca3b54fbebf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/27/6489b694-ce4d-4814-8b05-04d09176e20b.png?resizew=159)
A.![]() | B.![]() | C.![]() | D.![]() |
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9 . 在同一副扑克牌中抽取2张“黑桃”,5张“梅花”,3张“方块”,将这10张牌背面朝上,从中任意抽取1张,是“方块”的概率为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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10 .
的最小值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d411368f20513820da24d742ea7535.png)
A.55 | B.2020 | C.2550 | D.5050 |
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