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M舱为普通舱70折， N舱为普通舱65折， Q舱为普通舱60折（含教师、医护人员、县级以上劳模）， T舱为普通舱55折， X舱为普通舱50折（含学生、长者）， U舱为普通舱45折， E舱为普通舱40折， W舱为普通舱35折， R舱为普通舱30折， O舱为普通舱25折， Z舱为代码共享留座专用舱， V舱为常旅客专用...
S_n=-n^2+31n=-(n-(31)/2)^2+(961)/4,当H取与(31)/2最接近的整数即15或16时,S_u最大,∴S_n≤S_(15),故选项B正确;对于C,a_(15)=-2*15+32=2,故选项C正确;对于D,S_(30)=-30^2+31*30=30≠q0,故选项D错误.方法二:∵等差数列\(a_n\)满足S_(12)=S_(19),∴S...
已知数列\(a_n\)的前H项和S_u=n^2+2n,c=-1/2,n=-1,则使c_1+c_2+c_3+⋯+c_m≤(19)/(30)成立的HI的最大值为(
Introduced by GE as a competitor to the EMD SD40 and SD40-2, the U23C and U30C locomotive chassis were one of GEs earliest locomotive successes. Nicknamed U-Boats, these units were used in multiple services, pulling coal trains, general freight, and even as a test-power unit for the ...
[资料简介]SONY索尼HXR-NX30C HXR-NX30E HXR-NX30J数码摄像机 HXR-NX30N HXR-NX30P HXR-NX30U维修手册,本摄像机维修手册为电子版-电路图 大小:14.27 MB 格式:PDF 语言:英文 English Service Manual Download 页数:101页 所有电路图真实有效,如有任何疑问请在本页底部联系我们!
解答:解:∵已知U=N,A={x|x2-x-30>0}={x|(x+5)(x-6)>0}={x|x<-5,或 x>6},则∁UA={x|-5≤x≤6}={0,1,2,3,4,5,6},故选A.点评:本题主要考查一元二次不等式的解法,集合的补集的定义和求法,属于基础题.反馈 收藏
解析 B由已知条件化简得出\(a_1+d≥3a_1+2d≤6.,利用不等式的基本性质可求得a_1的最小值.【详解】设等差数列\(a_n\)的公差为d,由条件\(a_2=a_1+d=3S_5=5a_1+10d≤30.,可得\(a_1+d≥3a_1+2d≤6.,由不等式的性质可得a_1=2(a_1+d)-(a_1+2d)≥2*3-6=0.故选:B. ...
伊顿电磁换向阀DG5V-5-6C-T-M-U-H7-10 DG5V-5-2C-2-M-U-H7-30 伊顿电磁换向阀DG5V-5-6C-T-M-U-H7-10 DG5V-5-2C-2-M-U-H7-30 伊顿插装阀CVCS-16-N-B29-10 CVCS-16-N-20 CVCS 16 N 20 伊顿插装阀CVCS-16-N-B29-10 CVCS-16-N-20 CVCS 16 N 20...
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