=[9* vector{a} , 2* vector{a}]+[ vector{b} , 2* vector{a}]+[9*vector{a} × (-8)* vector{b}]+[ vector{b} × (-8) *vector{b}]=
=18 [vector{a} , vector{a}]+2 [vector{b} , vector{a}]-72[ vector{a} , vector{b}]-8[ vector{b} , vector{b}]=
по свойству векторного произведения векторов: [r] [vector{b} × vector{a}]=-[ vector{a} × vector{b}][/r]
=18 [vector{a}, vector{a}]-74 [vector{a} , vector{b}]-8[ vector{b} , vector{b}]=
по свойству векторного произведения векторов: [r] [vector{a} × vector{b}]=[ vector{b} × vector{b}]=0[/r]
=-74 [vector{a} , vector{b}]