设四阶方阵A=(a,r2,r3,r4)B=(b,r2,r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=—1,则|A+2设四阶方阵A=(a,-r2,r3,-r4)B=(b,r2,-r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=1,则|A-B|=?
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![设四阶方阵A=(a,r2,r3,r4)B=(b,r2,r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=—1,则|A+2设四阶方阵A=(a,-r2,r3,-r4)B=(b,r2,-r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=1,则|A-B|=?](/uploads/image/z/6069512-56-2.jpg?t=%E8%AE%BE%E5%9B%9B%E9%98%B6%E6%96%B9%E9%98%B5A%3D%28a%2Cr2%2Cr3%2Cr4%29B%3D%28b%2Cr2%2Cr3%2Cr4%29%E5%85%B6%E4%B8%ADa%2Cb%2Cr2%2Cr3%2Cr4%E5%9D%87%E4%B8%BA%E5%9B%9B%E7%BB%B4%E5%88%97%E5%90%91%E9%87%8F%2C%E4%B8%94%7CA%7C%3D4%2C%7CB%7C%3D%E2%80%941%2C%E5%88%99%7CA%2B2%E8%AE%BE%E5%9B%9B%E9%98%B6%E6%96%B9%E9%98%B5A%3D%28a%2C-r2%2Cr3%2C-r4%29B%3D%28b%2Cr2%2C-r3%2Cr4%29%E5%85%B6%E4%B8%ADa%2Cb%2Cr2%2Cr3%2Cr4%E5%9D%87%E4%B8%BA%E5%9B%9B%E7%BB%B4%E5%88%97%E5%90%91%E9%87%8F%2C%E4%B8%94%7CA%7C%3D4%2C%7CB%7C%3D1%2C%E5%88%99%7CA-B%7C%3D%3F)
设四阶方阵A=(a,r2,r3,r4)B=(b,r2,r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=—1,则|A+2设四阶方阵A=(a,-r2,r3,-r4)B=(b,r2,-r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=1,则|A-B|=?
设四阶方阵A=(a,r2,r3,r4)B=(b,r2,r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=—1,则|A+2
设四阶方阵A=(a,-r2,r3,-r4)B=(b,r2,-r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=1,则|A-B|=?
设四阶方阵A=(a,r2,r3,r4)B=(b,r2,r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=—1,则|A+2设四阶方阵A=(a,-r2,r3,-r4)B=(b,r2,-r3,r4)其中a,b,r2,r3,r4均为四维列向量,且|A|=4,|B|=1,则|A-B|=?
|A|=|a -r2 r3 -r4|= -|a r2 r3 -r4|=|a r2 r3 r4|=4 ,
|B|=|b r2 -r3 r4|= -|b r2 r3 r4|=1 ,(不知到底是 1 还是 -1 .以后面的为准)
所以 |a-b r2 r3 r4|=|a r2 r3 r4|-|b r2 r3 r4|=4+1=5 ,
那么 |A-B|=|a-b -2r2 2r3 -2r4|=(-2)*2*(-2)|a-b r2 r3 r4|=8*5=40 .
(如果 |B|= -1 ,那么结果就是 24)