1) √19
2) √30, √170
3) (4; 2,5; 2)
Объяснение:
1) AB=A-B=(5-2; -1-(-2); 3-4)=(3; -3; -1)
|AB|=√(3²+(-3)²+(-1)²)=√(9+9+1)=√19
2) 2b-c=2·(3;1;-2)-(1;4;-3)=(2·3-1; 2·1-4; 2·(-2)-(-3))=(5; -2; -1)
|2b-c|=√(5²+(-2)²+(-1)²)=√(25+4+1)=√30
3c-b=3·(1;4;-3) - (3;1;-2)=(3; 12; -9) - (3;1;-2) =(3-3; 12-1; -9-(-2))=(0; 11; -7)
| 3c -b |=√(0²+11²+(-7)²)=√(0+121+49)=√170
3) Середина
1) √19
2) √30, √170
3) (4; 2,5; 2)
Объяснение:
1) AB=A-B=(5-2; -1-(-2); 3-4)=(3; -3; -1)
|AB|=√(3²+(-3)²+(-1)²)=√(9+9+1)=√19
2) 2b-c=2·(3;1;-2)-(1;4;-3)=(2·3-1; 2·1-4; 2·(-2)-(-3))=(5; -2; -1)
|2b-c|=√(5²+(-2)²+(-1)²)=√(25+4+1)=√30
3c-b=3·(1;4;-3) - (3;1;-2)=(3; 12; -9) - (3;1;-2) =(3-3; 12-1; -9-(-2))=(0; 11; -7)
| 3c -b |=√(0²+11²+(-7)²)=√(0+121+49)=√170
3) Середина