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Mathematics
Mathematics
Problem
If A, B, C, D and E are five coplanar points, then the value of
D
A
→
+
D
B
→
+
D
C
→
+
A
E
→
+
B
E
→
+
C
E
→
\overrightarrow{DA} + \overrightarrow{DB} + \overrightarrow{DC} + \overrightarrow{AE} + \overrightarrow{BE} + \overrightarrow{CE}
D
A
+
D
B
+
D
C
+
A
E
+
B
E
+
C
E
is equal to (1)
D
E
→
\overrightarrow{DE}
D
E
(3)
2
(
D
E
→
)
2(\overrightarrow{DE})
2
(
D
E
)
(2)
3
(
D
E
→
)
3(\overrightarrow{DE})
3
(
D
E
)
(4)
4
(
E
D
→
)
4(\overrightarrow{ED})
4
(
E
D
)
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