[-A31] ______ sometimes keeps her awake at night ______ John is getting more and morequiet at home .A.That ; what B.What ; that C.It ; that D.Whether ; what 翻译并分析

[-A31] ______ sometimes keeps her awake at night ______ John is getting more and morequiet at home .A.That ; what B.What ; that C.It ; that D.Whether ; what 翻译并分析 求教I like___.___I can't play it ____.What club do you want to ________?I want to join the tennis club .And ______?It's hard to say.I ______golf,but I guess I like chess better._______you often play chess?________,very often.How about a game someti (>______ ______ 矩阵(a11 a12 a21 a22 a31 a32) 向量组线性矩阵A=(a11 a12 a21 a22 a31 a32) 的行向量组线性 若3阶行列式 a11 a12 a13 a21 a22 a23 =1 a31 a32 a33若3阶行列式a11 a12 a13a21 a22 a23 =1a31 a32 a33 则行列式4a11 5a11+3a12 a134a21 5a21+3a22 a23 4a31 5a31+3a32 a33 行列式计算 a11 a12 a13 a21 a22 a23 a21 a22 a23 =2 求a11 a12 a13 a31 a32 a33 a31 a32 a33a11 a12 a13 a21 a22 a23 a31 a32 a33=2求a21 2a22 3a23 a11 2a12 3a13 a31 2a32 四阶行列式中,带负号且包含a23 和a31的项为? 若等差数列前30项和是50,前50项和是30,求前80项和S50-S30=a31+a32+…+a50=20(a31+a50)/2=10(a31+a50)=10(a1+a80)=30-50=-20.∴a1+a80=-2 ∴S80=80(a1+a80)/2 =-80.解题是这样的,我想问这一步是什么意思=20(a31+a50)/2=10(a31+a50) 一往无前成语接龙一往无前______,______,______,______,______,______,______,______,______,______,______,左右逢源,______,______,______,______,______,______,______,______,______,神清气爽 明哲保身 ______ ______ ______ ______ ______ [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] 大一线数A为三阶方阵 满足A的伴随矩阵=A的转置矩阵 若a31=a32=a33大于0 则a31的值为?答案是三分之根号三. 用VB编程：做一个倒起的直角三角形a11 a21 a22 a31 a32 a33 a41 a42 a43 a44 把它倒成这个 a11 a21 a31 a41 a22 a32 a42 a33 a43 a44 成语接龙6个万众一心-______-______-______-______-______-______举世闻名-______-______-______-______-______-______志同道合-______-______-______-______-______-______ 已知数列{an}满足a1=2,an+1-an=an+1*an,那么a31等于 已知3阶行列式a11 a12 a13,a21 a22 a23,a31 a32 a33=2,算a11 a12 a13,10a21 10a22 10a23,a31 a32 a33的值1-2-1 已知3阶行列式a11 a12 a13,a21 a22 a23,a31 a32 a33=2,计算a11 a12 a13,10a21 10a22 10a23,a31 a32 a33的值,结果=?谢谢老师们. 已知数列{an}满足a1=2,a(n+1)-an=a(n+1）*an,则a31=?