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maksim2015vip
@maksim2015vip
April 2021
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Легкие задачи срочно! 100 баллов!
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yugolovin
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1. С(0;0;-c), c>0. BC^2=(0+1)²+(0+1)²+(-c-3)²=c²+6c+11,
AC²=(0-1)²+(0+1)²+(-c-1)²=c²+2c+3; BC²=3AC²⇒c²+6c+11=3c²+6c+9; c²=1; c=1 (так как c>0); C(0;0;-1).
M - середина AB⇒M(0;-1;2); CM²=(0-0)²+(-1-0)²+(2+1)²=10; CM=√10
2. |p|²=(-1)²+2²+1²=6; |p|=√6; |m|=3√6⇒m=-3p⇒m{3;-6;-3}
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Answers & Comments
Verified answer
1. С(0;0;-c), c>0. BC^2=(0+1)²+(0+1)²+(-c-3)²=c²+6c+11,AC²=(0-1)²+(0+1)²+(-c-1)²=c²+2c+3; BC²=3AC²⇒c²+6c+11=3c²+6c+9; c²=1; c=1 (так как c>0); C(0;0;-1).
M - середина AB⇒M(0;-1;2); CM²=(0-0)²+(-1-0)²+(2+1)²=10; CM=√10
2. |p|²=(-1)²+2²+1²=6; |p|=√6; |m|=3√6⇒m=-3p⇒m{3;-6;-3}