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danilv1
@danilv1
August 2022
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sedinalana
Verified answer
1
m{-2;1;-1}⇒2m{-4;2;-2}
n{1;3;2}
2m-n{-5;-1;-4}
|2m-n|=√(25+1+16)=√42
|2m|-|n|=√(16+4+4)-√(1+9+4)=√24-√14
2
1)O(0;1,5;0)-середина BD и AC
xC=2x0-xA=0-1=-1
yC=2yO-yA=3-3=0
zC=2z0-zA=0+1=1
C(-1;0;1)
xD=2xO-xB=0+2=2
yD=2yO-yB=3-2=1
zC=2zO-zB=0-0=0
D(2;1;0)
BC=√(-1+2)²+(0-1)²+(1-0)²=√(1+1+1)=√3
AD{1;-2;1}
AD=i-2j+k
1 votes
Thanks 1
danilv1
yD=2yO-yB=3-2=1 ---- А здесь разве не 3 -1 =2?
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Answers & Comments
Verified answer
1m{-2;1;-1}⇒2m{-4;2;-2}
n{1;3;2}
2m-n{-5;-1;-4}
|2m-n|=√(25+1+16)=√42
|2m|-|n|=√(16+4+4)-√(1+9+4)=√24-√14
2
1)O(0;1,5;0)-середина BD и AC
xC=2x0-xA=0-1=-1
yC=2yO-yA=3-3=0
zC=2z0-zA=0+1=1
C(-1;0;1)
xD=2xO-xB=0+2=2
yD=2yO-yB=3-2=1
zC=2zO-zB=0-0=0
D(2;1;0)
BC=√(-1+2)²+(0-1)²+(1-0)²=√(1+1+1)=√3
AD{1;-2;1}
AD=i-2j+k