x1 a12 a13 ...a1n /x1 x2 a23 ...a2n /x1 x2 x3 ...a3n / .../x

秋妍落雪2022-10-04 11:39:541条回答

x1 a12 a13 ...a1n /x1 x2 a23 ...a2n /x1 x2 x3 ...a3n / .../x1 x2 x3 ...

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A12, A12, wy_moon1年前2: Truqi_qu 共回答了23个问题 | 采纳率82.6%

角CAB30度,CBD60度,所以CBA120度则ACB30度,所以AB等于CB等于20所以BD等于10 再勾股定理得CD

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行列式问题我能算出来a11 -a12 a21 行列式问题 我能算出来a11 -a12 a21 -a22 =-1 深圳黑崽1年前1: 栎音共回答了17个问题 | 采纳率88.2%

D=-1
D1=
-b1 -a12
-b2 -a22
x1=D1/D=
-b1 a12
-b2 a22
这一点上看,A、C、D都错误

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[a11 a12 a13] [a21 a22 a23] [a31 a23 a33] =1 [a11 a12 a13] [a21 a22 a23] [a31 a23 a33] =1 则[a11+a12 a12--2a13 3a13] [a21+a22 a22--2a23 3a23] [a31+a32 a23--2a33 3a33] lixiaoy00941年前1: 尘影斑驳共回答了21个问题 | 采纳率85.7%

│[a11+a12 a12--2a13 3a13]
[a21+a22 a22--2a23 3a23]
[a31+a32 a23--2a33 3a33]│=
3│[a11+a12 a12--2a13 a13]
[a21+a22 a22--2a23 a23]
[a31+a32 a23--2a33 a33]│=
3│[a11+a12 a12 a13]
[a21+a22 a22 a23]
[a31+a32 a23 a33]│+
3│[a11+a12 --2a13 a13]
[a21+a22 --2a23 a23]
[a31+a32 --2a33 a33]│=
3│[a11 a12 a13]
[a21 a22 a23]
[a31 a23 a33]│+
3│[a12 a12 a13]{两行列成比例相等行列式为0}
[a22 a22 a23]
[a32 a23 a33]│-
6│[a11+a12 a13 a13]{两行列成比例相等行列式为0}
[a21+a22 a23 a23]
[a31+a32 a33 a33]│=3

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[-A12] Lucy's new job paid twice as much as she had made ___ [-A12] Lucy's new job paid twice as much as she had made ______ in the restaurant. A.working B.work C.to work D.worked 翻译并分析 答案A 小鱼08301年前4: ALEX88888 共回答了16个问题 | 采纳率100%

这是 08山东高考题：(2008山东)Lucy’s new job paid twice as much as she had made ____ in the restaurant.
　　A.working B.work C.to work D.worked
　　【解析】 A 关键在于根据句意分清句子成分.句意为：露丝的新工作付给她的钱是她在饭店工作是所赚钱的两倍.working 是had made 的伴随状语,和主语she 构成逻辑上的主动关系,所以用现在分词做状语.可排除过去分词worked.不定式to work做状语常表示目的或结果.
I hope that it will help you .__LEO.2011/6/8

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