:
-
-
-
- ( )
- ( )
. .
4 . ( , ) (, ).
A=(3;5;7)
B=(4;6;12)
C=(9;8;2)
D=(5;8;3)
a) +
dab=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-4)2+(5-6)2+(7-12)2=√27
dac=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-9)2+(5-8)2+(7-2)2=√70
dad=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-5)2+(5-8)2+(7-3)2=√29
dbc=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(4-9)2+(6-8)2+(12-2)2=√129
dbd=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(4-5)2+(6-8)2+(12-3)2=√86
dcd=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(9-5)2+(8-8)2+(2-3)2=√17
A | B | C | D | |
A | √27 | √70 | √29 | |
B | √129 | √86 | ||
C | √17 | |||
D |
(√17) (C D). ( : A √70 √29, B √129 √86)
A | B | CD | |
A | √27 | √29 | |
B | √86 | ||
CD |
(√27) (A B). ( : √29 √86)
AB | CD | |
AB | √29 | |
CD |
AB CD
: ( abcd)
a
b
c
d
b) +
dab=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-4)2+(5-6)2+(7-12)2=√27
dac=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-9)2+(5-8)2+(7-2)2=√70
dad=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-5)2+(5-8)2+(7-3)2=√29
dbc=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(4-9)2+(6-8)2+(12-2)2=√129
dbd=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(4-5)2+(6-8)2+(12-3)2=√86
|
|
dcd=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(9-5)2+(8-8)2+(2-3)2=√17
A | B | C | D | |
A | √27 | √70 | √29 | |
B | √129 | √86 | ||
C | √17 | |||
D |
(√17) (C D). ( : A √70 √29, B √129 √86)
A | B | CD | |
A | √27 | √70 | |
B | √129 | ||
CD |
(√27) (A B). ( : √70 √129)
AB | CD | |
AB | √129 | |
CD |
AB CD
c) +
dab=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-4)2+(5-6)2+(7-12)2=√27
dac=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-9)2+(5-8)2+(7-2)2=√70
dad=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(3-5)2+(5-8)2+(7-3)2=√29
dbc=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(4-9)2+(6-8)2+(12-2)2=√129
dbd=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(4-5)2+(6-8)2+(12-3)2=√86
dcd=√ (x1(1) -x2(1))2 + (x1(2) -x2(2))2 +(x1(3) -x2(3))2 = √(9-5)2+(8-8)2+(2-3)2=√17
A | B | C | D | |
A | √27 | √70 | √29 | |
B | √129 | √86 | ||
C | √17 | |||
D |
(√17) (C D). ( , )
A | B | CD | |
A | √27 | (√70+√29)/2=√47.3 | |
B | (√129+√86)/2=√106.414 | ||
CD |
(√27) (A B). ( , )
AB | CD | |
AB | (√70+√29+√129+√86)/4 | |
CD |
AB CD
,