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1 . 已知实数x,y,z满足,则下列说法错误的是( )
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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2 . 已知实数a,b,c,d满足
,则当
取得最小值时,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b751be741f255248afd1c48b5cb4d8eb.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f7acc70b6f0aa1c3b9a181abd29800e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e159c8203722a3c50784f7f6e65911e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b751be741f255248afd1c48b5cb4d8eb.png)
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3 . 若x,y,z均为正实数,则的最大值是
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4 . 若对于任意实数
,代数式
均有意义,则实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4675b8caffaae2c83058099703947c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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5 . 已知集合
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eda75373788be29bdf84d37e8d315b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
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6 . 已知
,则
可用a,b表示为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71fe50fd6a4f7933656d0405668ae942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33a97db9bda2d9fa1d9c7cc3acaffcfd.png)
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7 . 若
,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0fdda720f95c7e395fbfa98420fa316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
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8 . 若集合
有且仅有一个元素,则实数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb5ea441591451a8d473be3bb9115a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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9 . 已知全集
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d69e463fe196b4341193e32310ccb7.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860ebb6f76cd3cb9a265dfc233002a13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c30eadfda342d1488ae8edae11e0b03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d69e463fe196b4341193e32310ccb7.png)
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10 . 若
且
,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58df0c7adbd7f2a101e51deb7105035c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5997e111852b66ccff5504794c1721d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48716231946083664a565915a471e3b5.png)
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