知a1,a2,p1,p2,都是3维列向量,且行列式\a1,p1,r\=\a1,p2,r\=\a2,p1,r\=\a2,p2,r\=3,那么\-2r,a1+a2,p1+2p\=-36
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 01:45:44
![知a1,a2,p1,p2,都是3维列向量,且行列式\a1,p1,r\=\a1,p2,r\=\a2,p1,r\=\a2,p2,r\=3,那么\-2r,a1+a2,p1+2p\=-36](/uploads/image/z/9908024-32-4.jpg?t=%E7%9F%A5a1%2Ca2%2Cp1%2Cp2%2C%E9%83%BD%E6%98%AF3%E7%BB%B4%E5%88%97%E5%90%91%E9%87%8F%2C%E4%B8%94%E8%A1%8C%E5%88%97%E5%BC%8F%5Ca1%2Cp1%2Cr%5C%3D%5Ca1%2Cp2%2Cr%5C%3D%5Ca2%2Cp1%2Cr%5C%3D%5Ca2%2Cp2%2Cr%5C%3D3%2C%E9%82%A3%E4%B9%88%5C-2r%2Ca1%2Ba2%2Cp1%2B2p%5C%3D-36)
xRMN@JtiB\\ĺ0
^@BDĠAT1%1b4MWp:mfyyoF5hbȔQxg%x:ݰ VY5$Nk
g C9DĦIJIݯrYVQM+q="Os^"`d1L0IaQdzF*i{XD\`Ky'V;|hh'\lWUKgdY'?&|C͢N>4דo7gXfԾg G`]FE㔸SƓ"gyMɂ]1=Ukvnķ_%pe'"*bI,1:m['.]
知a1,a2,p1,p2,都是3维列向量,且行列式\a1,p1,r\=\a1,p2,r\=\a2,p1,r\=\a2,p2,r\=3,那么\-2r,a1+a2,p1+2p\=-36
知a1,a2,p1,p2,都是3维列向量,且行列式\a1,p1,r\=\a1,p2,r\=\a2,p1,r\=\a2,p2,r\=3,那么\-2r,a1+a2,p1+2p\
=-36
知a1,a2,p1,p2,都是3维列向量,且行列式\a1,p1,r\=\a1,p2,r\=\a2,p1,r\=\a2,p2,r\=3,那么\-2r,a1+a2,p1+2p\=-36
\-2r,a1+a2,p1+2p2\ = -2 [ \r,a1,p1+2p\ + \r,a2,p1+2p2\ ]
= -2 [ \r,a1,p1\ + \r,a1,2p2\ + \r,a2,p1\ + \r,a2,2p2\ ]
= -2 [ \a1,p1,r\ + 2\a1,p2,r\ + \a2,p1,r\ + 2\a2,p2,r\ ]
= -2 [ 3 +2*3 +3 +2*3 ]
= -2 * 18 = -36
是不是最后少打了个2?
首先提取出-2来,并根据行列式轮换变号原则(此例中不变号)
\-2r,a1+a2,p1+2p2\
=-2 \a1+a2,p1+2p2,r\
然后用分配率,展开为四项
=-2*(3+3+6+6)=-36