设α=(-1,1),β=(4,-2),
求([(α,α)β-1/3(α,β)α],6α).
解:([(α,α)β-1/3(α,β)α],6α)=([2β-1/3×(-6)α],6α) =((6,-2),(-6,6)) =6×(-6)+(-2)×6=-48
设α=(-1,1),β=(4,-2),
求([(α,α)β-1/3(α,β)α],6α).
解:([(α,α)β-1/3(α,β)α],6α)=([2β-1/3×(-6)α],6α) =((6,-2),(-6,6)) =6×(-6)+(-2)×6=-48