用比较审敛法或极限审敛法判别下列级数的收敛性:1、;2、 .562de09c498e8943b8a40c04.gif562de09d498e8943b8a40c05.gif
电路如图所示,直流电压 U I =10 V ,稳压二极管的稳定电压 U Z = 6 V ,则限流电阻 R 上的压降 U R 为 ( ) 。http://p.ananas.chaoxing.com/star3/origin/b22855df6e907c63e79f6ceb6f2ce95a.png
设函数连续,则( )。80e577d50170a6b8a7afeb84c279ae2c
设,下列命题中正确的是().aab3b07c533686c419322540a175b8c0.png
过点且与平面垂直的直线是( )。e1a542de644ee69a3bd3b6a039b7f49b.png7224b8b166308867e19b58c3bb14c2ee.png
函数在点处沿从点到点的方向的方向导数为_____________56279220498e8943b8a3559f.gif562792e5498e8943b8a355b8.gif562792e5498e8943b8a355b8.gif562792e6498e8943b8a355b9.gif
当时, 对应的的值, 则的拉格朗日插值基函数=c10e04ab0b09ed83dd863973fbdd937e.png49b00970993f8a2d693d92893d717b8e.pngf8fd6418fc854d2d5def0224cc205f94.png49b00970993f8a2d693d92893d717b8e.pngaf4ea4c77e5c34971b9d51b61342baa7.png
已知平面图形的形心为C,面积为A,对z轴的惯性矩为Iz,则图形对在z1轴的惯性矩正确的是 。7d6ea364e0b641eb65a516f6cff77664.png
当时, 则的二次插值多项式为2b4992b2332620a29eaa94b1c9cc2637.png30b6114a3aa719c364e25da3e935bcbe.png49b00970993f8a2d693d92893d717b8e.png
下图的花卉是db546b5d15cea7350b925082771e3b8b
以四分音符为一拍,将下列音符符尾相连正确的是?9b7298f5ea2ef969cce3b8a4c358583d.jpg
由于相关系数r和回归系数b算式中的分子都是,所以r和b的正负号必定一致。4c29af05340d6ea5a70fa2e003c8a92d.png
(选填“线性相关“”线性无关”)b8a0130d62d60a7fce7abb44243e1523.png
设事件,则一定有( )。3b893ad14a48b8aa4386bf41f87847d1.gif
如图,白方双象要3步杀棋,第一步如何走?5d2a688ba49f6b81e39bd34f6eeca065.jpg
已知=3,=26, =72,则=________562ce01e498e8943b8a3f2ec.gif562cdfe5e4b04f4c2bf8dc9e.gif562cdfe7e4b04f4c2bf8dc9f.gif562ce027498e8943b8a3f2ed.gif
计算,其中为折线,这里依次为点(0,0,0),(0,0,2),(1,0,2),(1,3,2);562dcc87498e8943b8a40769.gif562d8a89498e8943b8a3fa8d.gif562dcc49e4b04f4c2bf8fc7a.gif562dcc4fe4b04f4c2bf8fc7d.gif
直线和平面的关系是_________ .562d8a61498e8943b8a3fa89.gif562d8a22e4b04f4c2bf8e92b.gif
函数的奇偶性是( )。b8a74f9c74eb9fc23cfe09545db48a0b.gif
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随机变量X之密度函数 则a=( )http://image.zhihuishu.com/zhs/onlineexam/ueditor/201802/9ded8eb7f4d24d558b8bf0b8a5ffcd1b.png
左边图形折起来,将得到右边哪一个图形?<img src='https://img2.soutiyun.com/ask/uploadfile/3693001-3696000/e8e008d41f105ad8a49c8a799d652407.jpg' />
设矩阵满足方程<img src='https://img2.soutiyun.com/ask/uploadfile/10923001-10926000/62839ccf0758320892b8a63233c10674.jpg' />
http://nos.netease.com/edu-image/6DDAE9359834FF1CF8A6DCB70D5440B8-1444357787667?imageView&thumbnail=520x520&quality=100