问题
填空题
|
|
答案
∵
+a
+b
=c 0
∴(
+a
+b
)2=0c
∴
2+a
2+b
2+2(c
•a
+c
•b
+c
•a
)=0b
∵|
|=|a
|=|b
|=1c
∴
•a
+c
•b
+c
•a
=-b 3 2
故答案为:-3 2
|
|
∵
+a
+b
=c 0
∴(
+a
+b
)2=0c
∴
2+a
2+b
2+2(c
•a
+c
•b
+c
•a
)=0b
∵|
|=|a
|=|b
|=1c
∴
•a
+c
•b
+c
•a
=-b 3 2
故答案为:-3 2