已知a=(5,8),b=(2,3),c=(1,-2),则(a*b)*c=
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已知a=(5,8),b=(2,3),c=(1,-2),则(a*b)*c=
已知a=(5,8),b=(2,3),c=(1,-2),则(a*b)*c=
已知a=(5,8),b=(2,3),c=(1,-2),则(a*b)*c=
a*b*c=5*2*1+8*3*(-2)=10-48=-38
(A*B)*C=(5*2+8*3)*(1,-2)=34*(1,-2)=(34,-68)
a*b=(5,8)*(2,3)
=5×2+8×3
=34
于是
(a*b)*c
=34*(1,-2)
=(34,-68)