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共找到 1766852 与若A=1且A大于等于pai/3小于等于pai 相关的结果,耗时760 ms
(本小题满分12分)已知数列是等差数列,数列的前n项和是,且.(I)求数列的通项公式;(II)求证:数列是等比数列;
数学
王老师从班会费中取出一笔钱去买奖品——圆珠笔,若只买A型圆珠笔,则恰好可买15枝;若只买B型圆珠笔,……则恰好可买30枝.实际上王老师买的A型圆珠笔和B型圆珠笔的枝数相同,且恰好用完这
数学
Follow the example to make sentences.Example:I am Lucy.(I am not a doctor.I am a nurse.)(doctor,nurse)1.I am jones.___________________
英语
____________.(
I think..I"m a bad girl I must give up.MUST!I think.I"m a bad girl I must give up.MUST!
英语
A:Can【I】【help】you?B:I"d[ ]a[ruler]【尺子】,please.请问,这样填对吗,还剩下一个我不会帮帮忙.A:Can【I】【help】you?B:I"d[ ]a[ruler]【尺子】,please.请问,这样填对吗,还剩下一个我不会
英语
帮忙.
(1)选修4-2:矩阵与变换若矩阵A有特征值λ1=2,λ2=-1,它们所对应的特征向量分别为e1=10和e2=01.(I)求矩阵A;(II)求曲线x2+y2=1在矩阵A的变换下得到的新曲线方程.(2)选修4-4:坐标
其他
cosθ(θ为参数),C2的
根据情景,用合适的句子不全对话A:Good morning!I"m a repoter from CCTVA:Good morning!I"m a repoter from CCTV.May I ask you some questions?B:________wha
英语
are they?A;__
if i say i don't think much of this book,this means that-a.i never read itb.i seldom think about itc.i have no idea of itd.i have a po
英语
r opinion of i
首字母英语填空题目!一.根据首字母填空I"m a (m ) school student.I go to school (e ) morning except (S ) and Sundays.My home is a little (f ) from the sch
英语
ol so I (c ) a
英语翻译求翻译啊,这是歌词,求英语高手翻译I am a bird girlI am a bird girlI am a bird girlI am a bird girl now I've got my heart Here in my handsI've got m
其他
heart Here in
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