|A|=|α,γ1,γ2,γ3| 对不
|A+2B|
= |α+2β,3γ1,3γ2,3γ3|
= 3^3|α+2β,γ1,γ2,γ3|
= 27(|α,γ1,γ2,γ3|+|2β,γ1,γ2,γ3|)
= 27(|A|+2|B|)
= 27*(5+2*(-2))
= 27.
|A|=|α,γ1,γ2,γ3| 对不
|A+2B|
= |α+2β,3γ1,3γ2,3γ3|
= 3^3|α+2β,γ1,γ2,γ3|
= 27(|α,γ1,γ2,γ3|+|2β,γ1,γ2,γ3|)
= 27(|A|+2|B|)
= 27*(5+2*(-2))
= 27.