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更新时间:2020-10-18 18:13:06
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【推荐1】下列说法:
(1)设a,b是正实数,则“a>b>1”是“log2a>log2b”的充要条件;
(2)对于实数a,b,c,如果ac>bc,则a>b;
(3)“m=
”是直线(m+2)x+3my+1=0与直线(m-2)x+(m+2)y-3=0相互垂直的充分不必要条件;
(4)等比数列{an}的公比为q,则“a1>0且q>1”是对任意n∈N+,都有an+1>an的充分不必要条件;
其中正确的命题有______
(1)设a,b是正实数,则“a>b>1”是“log2a>log2b”的充要条件;
(2)对于实数a,b,c,如果ac>bc,则a>b;
(3)“m=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
(4)等比数列{an}的公比为q,则“a1>0且q>1”是对任意n∈N+,都有an+1>an的充分不必要条件;
其中正确的命题有
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【推荐2】已知函数
(
),写出
的充要条件________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c83e84f328601d86e1f713060546494.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4166972dec0aa3e8694a44eeb941a08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
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【推荐1】已知
是方程
的两个实根,且不等式
对任意
恒成立,则实数
的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81d6c9d20a5b1abf77d4d70d5ac9ba77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f6a122db673b7f78cf66c44e934b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2725a89d93c791f7a0098f4964587905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】设
:
在
和
上是单调增函数;
:不等式
的解集为
.若
为假,
为真,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1fb8e5e03b89beb57be016a282cfa4e.png)
![](https://img.xkw.com/dksih/QBM/2016/5/5/1572616689238016/1572616694980608/STEM/e59a426c335c4148b365ab8b6fa5eab5.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2016/5/5/1572616689238016/1572616694980608/STEM/7498d9f1d3e844ef9b5c1bab6f0b8106.png?resizew=55)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://img.xkw.com/dksih/QBM/2016/5/5/1572616689238016/1572616694980608/STEM/89299597488b4ebabd16da5f29c232b2.png?resizew=77)
![](https://img.xkw.com/dksih/QBM/2016/5/5/1572616689238016/1572616694980608/STEM/998b64d955274b8d9123041982604a77.png?resizew=16)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://img.xkw.com/dksih/QBM/2016/5/5/1572616689238016/1572616694980608/STEM/bf06a17e2c3447339f1193db31d52675.png?resizew=13)
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