Question

Dau si coroana celui care o face, e foarte urgent.

Answer 1

Răspuns:

u=3i+2j

v=i-2j

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a)3u=3(3i_2j)=9i-6j

2v=2(i-2i)=2i-4i

3u+2v=9i-6j+2i-4j=11i-6j

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b)u+v=3i+2j+i-2j=4i

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c) u-v=3i+2j-(i-2j)=3i+2j+4j=3i+6j

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d) lvl=l9i-6jl=√(9²+(-6)²=√(81+36)=√117=3√13

e)u*v=(3i+2j)(i-2j)=3i²-4j²=3-4= -1

Explicație pas cu pas: