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单选题 设u=cos(xy),则du=( )
学科：高等数学II(下册）
时间：2023-06-27 05:56:50
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题目1单选题
<img src="https://tihai-oss-cloud.itihey.com/img/96bee90746786b62c4f1164d14e94e8f.webp">A. <img src="https://tihai-oss-cloud.itihey.com/img/3ffd0aca1dea87f333ac76369e01a793.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/baaa31fe71b11e9eebc63cc25c873389.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/729a1faa1331e341486391abd275b3c8.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/24badbfb0ad6cbc1b972a5863100dafc.png">
题目2单选题
<img src="https://tihai-oss-cloud.itihey.com/img/d64cc571e4f98a3efc854c4119d39959.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/3cc8737be3e50dbc5095e557a112a0d4.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/7b585ae9ad288b9ebb814c7e3eb3573d.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/405dc05890985f7486addcca50f5778e.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/7cae391dfa669177394600e4360b7600.png">
题目3单选题
设u=cos(xy),则du=( )A. -cos(xy)(ydx+xdy)B. -sin(xy)(ydx+xdy)C. cos(xy)(ydx+xdy)D. sin(xy)(ydx+xdy)
题目4单选题
<img src="https://tihai-oss-cloud.itihey.com/img/5073f151ebb9762dbf827d04cf10f599.png">A. 2B. 3C. 1D. 0
题目5单选题
设二元函数<img src="https://tihai-oss-cloud.itihey.com/img/0ecab09d212b3f96ee2a867d9cde394c.png">,则该函数在点<img src="https://tihai-oss-cloud.itihey.com/img/04ff99e5ab1322271d045fbcee471da7.png">处沿方向<img src="https://tihai-oss-cloud.itihey.com/img/9c84cedc82ce6367d7da720b484f5ff0.png">的方向导数为( )A. 10B. 5C. <img src="https://tihai-oss-cloud.itihey.com/img/10ced756396acb77eaad75c9cf7ff58d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/44addd038ad4e467a601313e030f1cf9.png">
题目6单选题
函数<img src="https://tihai-oss-cloud.itihey.com/img/7ba1a084996ac8519d374a769213ee1c.png">在点(1,-1,1)处方向导数最大值为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/b90d19eea88b4ca1177711073035ff36.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/06ac5c0348b8e1b687e6e7e5efc81d3b.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/60c1e3182eda1e1ffc67f24b512c6bb1.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/0e7a2c01952cd47d17a99f5398c06d59.png">
题目7单选题
<img src="https://tihai-oss-cloud.itihey.com/img/7b5c145cfd18de2462149f75d3df9fcb.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/ac8ccd03ce14a3f5d2d97851d6f2244c.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/951eb877fd4a7ba435a9feb5023046fe.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/5635b34826c1e98ba3a6e1f897d8ad59.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/b992f9accae490b513a8cf5905d91fec.png">
题目8单选题
<img src="https://tihai-oss-cloud.itihey.com/img/67616fe80a0f232e137b7845f94df72a.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/ee31e08de9ded16547eaddf29d7618eb.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/5e2b369b2e900357e8cb91e6da299600.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/b3d537584c8e79e78d59f5dc9d7e7c65.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/44addd038ad4e467a601313e030f1cf9.png">
题目9单选题
函数 <img src="https://tihai-oss-cloud.itihey.com/img/bcfd4c42a09746d1b9ebe6ab259cabb6.png"> 在点<img src="https://tihai-oss-cloud.itihey.com/img/1036dd2ae9c69d7ecb8fd5370719b9ce.png"> 处沿 <img src="https://tihai-oss-cloud.itihey.com/img/9865b44027cc07d64183121222aabadf.png"> 的方向导数为A. -1B. 0C. <img src="https://tihai-oss-cloud.itihey.com/img/fafde7ffc551d96d1a576e919ca6ed6c.png">D. 1
题目10单选题
<img src="https://tihai-oss-cloud.itihey.com/img/825fa1ea8812d3e548791526bd8694b0.webp">A. <img src="https://tihai-oss-cloud.itihey.com/img/ec28daec64a2f4d0174bd88b77b19d8c.webp">B. <img src="https://tihai-oss-cloud.itihey.com/img/38c09f27d329600c0db76abe13e09c16.webp">C. <img src="https://tihai-oss-cloud.itihey.com/img/92a3478acd914d716d30ee3313ea82a3.webp">D. <img src="https://tihai-oss-cloud.itihey.com/img/a61197ea767e58b89c331bc8d61c462a.webp">
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