设3阶矩阵,A=(a,b,c),B=(d,b,c),且|A|=3.|B|=5,则|A+B|=
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![设3阶矩阵,A=(a,b,c),B=(d,b,c),且|A|=3.|B|=5,则|A+B|=](/uploads/image/z/8753198-14-8.jpg?t=%E8%AE%BE3%E9%98%B6%E7%9F%A9%E9%98%B5%2CA%3D%28a%2Cb%2Cc%29%2CB%3D%28d%2Cb%2Cc%29%2C%E4%B8%94%EF%BD%9CA%EF%BD%9C%3D3.%EF%BD%9CB%EF%BD%9C%3D5%2C%E5%88%99%EF%BD%9CA%2BB%EF%BD%9C%3D)
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设3阶矩阵,A=(a,b,c),B=(d,b,c),且|A|=3.|B|=5,则|A+B|=
设3阶矩阵,A=(a,b,c),B=(d,b,c),且|A|=3.|B|=5,则|A+B|=
设3阶矩阵,A=(a,b,c),B=(d,b,c),且|A|=3.|B|=5,则|A+B|=
A+B=(a+d,2b,2c)
|A+B|=|2*2(a+d b c)|=4|a+d b c|
|a+d b c |=|A|+|B|=3+5=8
所以 |A+B|=32