Question

ПОМОГИТЕ СРОЧНО!!!!!!!!

Answer 1

Ответ:

Пошаговое объяснение:

$\displaystyle \vec a=\left [ {{-5} \atop {6}} \right] ,\vec b=\left [ {{1} \atop {-7}} \right]\\\vec u=3\vec a-2\vec b=3\left [ {{-5} \atop {6}} \right]-2\left [ {{1} \atop {-7}} \right]=\left [ {{-5*3} \atop {6*3}} \right]-\left [ {{1*2} \atop {-7*2}} \right]=\left [ {{-15} \atop {18}} \right]-\left [ {{2} \atop {-14}} \right]=\left [ {{-15-2} \atop {18-(-14)}} \right]=\left [ {{-17} \atop {32}} \right]\\\vec u=2\vec a+\vec b=2\left [ {{-5} \atop {6}} \right]+\left [ {{1} \atop {-7}} \right]=$

$\displaystyle \left [ {{-5*2} \atop {6*2}} \right]+\left [ {{1} \atop {-7}} \right]=\left [ {{-10} \atop {12}} \right]+\left [ {{1} \atop {-7}} \right]=\left [ {{-10+1} \atop {12-7}} \right]=\left [ {{-9} \atop {5}} \right]$