найдите расстояние между точками: А(2;4;-1) и B(4;2;-2).
d=sqrt((4-2)^2+(2-4)^2+(-2+1)^2)=sqrt(4+4+1)=sqrt(9)=3
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d=sqrt((4-2)^2+(2-4)^2+(-2+1)^2)=sqrt(4+4+1)=sqrt(9)=3