线性代数。选择题第一题。我做的答案A。正确答案D请问哪里错了。谢谢。给下过程_百度知道
线性代数。选择题第一题。我做的答案A。正确答案D请问哪里错了。谢谢。给下过程
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我有更好的答案
右边的分块矩阵不是n阶的，而是2n阶的，所以，要乘(-3)^(2n)=3^(2n)
望采纳～～谢谢
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出门在外也不愁求高人帮我做下10道英语选择题,第1题 单选题 When I arrived at the university,I was told that I would have to _______ a room to live in.1.borrow 2.lend 3.rent 4.own 第2题 单选题 Most students did ____________ in the final exam.1.v_百度作业帮
求高人帮我做下10道英语选择题,第1题 单选题 When I arrived at the university,I was told that I would have to _______ a room to live in.1.borrow 2.lend 3.rent 4.own 第2题 单选题 Most students did ____________ in the final exam.1.very good 2.very fine 3.very nice 4.very well 第3题 单选题 When they ___________ arrived in America,everything seemed to go against them.1.in the first 2.first 3.firstly 4.first of all 第4题 单选题 In the old days,there were no drugs that could help people __________ heart diseases.1.drive 2.survive 3.arrive 4.alive 第5题 单选题 The small village has been turned _______ a large town.1.into 2.out 3.up 4.in 第6题 单选题 About ___________ students have joined the English Literature Society.1.three hundred of 2.three hundreds of 3.three hundreds 4.three hundred 第7题 单选题 Joe __________ last night and hurt his leg badly.1.tripped 2.made a trip 3.had a trip 4.took a trip 第8题 单选题 It takes ____________ of six months for a new type of computers to be produced.1.the amount 2.an amount 3.average 4.an average 第9题 单选题 The theater can well _____________ 500 people.1.sit 2.seat 3.be seated 4.be sitting 第10题 单选题 ____ all work could be done at home through the Internet,people would have very little chance of meeting each other.1.As if 2.If only 3.Only if 4.If
晓枫是神q80
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楼上九错误9——这家剧院可以坐500人
题目类型： 单选题 题目：When I arrived at the university, I was told that I would have to ___3___ a room to live in.
3,4,2,1,1,1,1,4,2,4
3/4/3/2/1/4/1/2/1/4
3When I arrived at the university, I was told that I would have to【rent 】a room to live in.
rent a room 租房（租借　前两个选项表示借　后一个表示获得得到　不符）Most students did【very ...
第九十两个题不太确定。
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3When I arrived at the university, I was told that I would have to【rent 】a room to live in.
rent a room 租房（borrow表示借进；lend表示借出；own表示拥有）Most students did【ve...
扫描下载二维码高等数学求极限题目：看看我错在哪里？并写出正确的解答方法_百度知道
高等数学求极限题目：看看我错在哪里？并写出正确的解答方法
提问者采纳
最后一步错了，写到倒数第二步就可以了，不用写最后一步。lim(x→0,y→0)(x+y)sin[1/(x+y)]因为(x+y)是无穷小，sin[1/(x+y)]是有界函数，无穷小与有界函数之积仍然是无穷小，所以结果为0，即lim(x→0,y→0)(x+y)sin[1/(x+y)]=0你最后一步之所以错了，是因为你使用重要极限lim(x→0)sinx/x=1时忽略了一个细节。那就是x必须趋于0，而在lim(x→0,y→0)sin[1/(x+y)]/[1/(x+y憨担封杆莩访凤诗脯涧)]中，[1/(x+y)]这个整体就相当于重要极限lim(x→0)sinx/x=1中的x，而[1/(x+y)]趋于无穷大，不满足趋于0的条件，所以这个地方不能使用重要极限。
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最后一步，分母是无穷大，分子是有界值，极限应为 0
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出门在外也不愁第10题,第一小题错了,直接写第二小题,讲下如何使用待定系数法转化为等比数列的方法求解这类型如an+1+pan+q(n)的递推数列.不用给出答案,答案已经用两种方法写出来了,只是同学的那个办法我_百度作业帮
第10题,第一小题错了,直接写第二小题,讲下如何使用待定系数法转化为等比数列的方法求解这类型如an+1+pan+q(n)的递推数列.不用给出答案,答案已经用两种方法写出来了,只是同学的那个办法我没看懂,不能灵活运用
心系冬季36826
我已经弄明白过了，不过还是谢谢你哦
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