解题方法
1 . 在下列四个命题中:
①在区间
内随机取两个实数x、y,则满足
的概率为
;
②设m、n是两条不同的直线,
、
是两个不同的平面,则命题“若m//
,n//
,则
//
”是真命题;
③圆
上到直线3x+4y-11=0的距离等于1的点的个数有3个;
④已知函数f(x)是定义在R上的偶函数,且当
时,函数f(x)是单调递减函数.若
,
,
,则b<a<c.
正确命题的序号是___________ .
①在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd6c5e96484321e418685bc62604362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be061934b377c6aaa58bf319d64624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357821e0e5595eaf3028df63d47b2c58.png)
②设m、n是两条不同的直线,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
③圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c557eb985eab63fd928c323c03982e.png)
④已知函数f(x)是定义在R上的偶函数,且当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757e1b6ee1ce5c1cc2d3b077830ddc99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a0e17ac59583b5213e3a58232210d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850809471112698b0eee9d18eea61e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8c3c5b15ee3e9b871348d8b6abc78c8.png)
正确命题的序号是
您最近一年使用:0次
2 . 在下列四个命题中:
①把函数
的图象向左平移
个单位后,与函数
的图象重合;
②曲线
在点
处的切线方程为
;
③圆
上到直线
的距离等于1的点的个数有3个;
④在区间
内随机取两个实数x、y,则满足
的概率为
.
正确命题的序号是_______
①把函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/325f9e2f7784ebdd64292e805884dfa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2416d7b4a3343f6bd02c6f9c2c9e94c1.png)
②曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34b328c034bc234f2e78beb36468216d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48bae82435aace6188d1153363197e42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c6d3c99b7004603ba9ea9c341b8b3f.png)
③圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503e88615cdce1e360e97165d1089372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ffddb423c76945c1884849c2f31070.png)
④在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3272b65a0bddafa695d989aa2c773703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be061934b377c6aaa58bf319d64624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca8b26c3ad6d892590290a2304126bd.png)
正确命题的序号是
您最近一年使用:0次