举一反三
- 已知向量的两个方向余弦分别为，则向量的单位向量为 。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/ddccbadd28ff4393bdbc528098c1dc43.pnghttp://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7904ae829dab4b16ad7979ea93482956.pnghttp://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/4c2541850dba41bbaf0047a783702fb8.png
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/6e6de13adf014e1f9fdc7954cb313377.png是由方程http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/6d1ea7ec74bb4607aee50aa325108197.png确定，求http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/1d60e0ceb7d14d26a00863c192e0bbf3.png（ ）
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/90c19a717ac34717836dbca4afba1bd9.png是由方程http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7648e783c2f24044bb84346d0e07e161.png确定，求http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/d24ed3aef9a94d38965289947da528f7.png（ ）
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/5f9f81d9a1184c2eb383cb81ebbe2768.png，若http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/410a0d9f8b4a4f82a6818a45f4a3b450.png，http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/637f75734cb849caa773da5377f55f5e.png，http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/29aefd40f6c54e788587a2115dd02467.png，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/631634fcf7854ec88eedede14de7c1de.png之间的大小顺序为（ ）<br>
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/44f4d22711964c23980340adb7809625.pnghttp://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3d4966e983de4b688abd5941e42a0548.png
内容
- 0
单击标准工具栏上的（ ）按钮可以打开“设计中心"面板。1、http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7a8ef85e77f8490babf1302f6cfb317f.png 2、 http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/9cb75f8a10154a279078690a7149876e.png 3、http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/451fea6688f4480fbf86d1a75006cfdc.png 4、http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/0eeb17dcbe1a455f84981040ae19ef0b.png
- 1
若闭区域D是由抛物线http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c2cce6ef434d42d1846dd63f086bd9c2.png及直线http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/71edcde95b7b408bb8275833b1187e4f.png所围成的闭区域，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/14ac0a7fff9c4ba1ad9a342140b961cf.png（ ）<br>
- 2
若http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/5c06779096154f7c8b702d66edce8df1.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/7d26b1d151c9438485fa20b9ca38af20.png处可微，则偏导数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/518027493bf540a1a080f49503d0afb3.png一定连续。<br>
- 3
点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/e0f6822f1d7d4e0c95e71ffed4adb0d3.png是函数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/adec3c1d59974ddf8cb6227a1488dbb5.png的（ ）
- 4
求函数http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/c7a245151812467d85af7a1cf91a4be0.png在点http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/917120f5d9354f20ad871d7acfc759d1.png处全微分，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/63eafd5e56d84117ba59026b91c8059e.png（ ）<br>