Предмет: Алгебра, автор: АлёнКа092799

помогите решить пожалуйста срочно

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Автор ответа: Utem

a(2;3;0) b(0;-3;-2) c(1;1;-1)
a-(1/2)b+c=(2;3;0)-(1/2)*(0;-3;-2)+(1;1;-1)=(2;3;0)-(0:2;-3:2;-2:2)+(1;1;-1)=(2;3;0)-(0;-1,5;-1)+(1;1;-1)=(2-0+1;3-(-1,5)+1;0-(-1)+(-1))=(3;5,5;0)

A(1;-4;7) B(5;6;-5)
|AB|=√(x₂-x₁)²+(y₂-y₁)²+(z₂-z₁)²=√(5-1)²+(6-(-4))²+((-5)-7)²=√16+100+144=√260=√4*65=2√65≈16,12

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