问题
填空题
已知|
|
答案
∵|
|=|a
|=|b
-a
|=1，b
∴|
-a
|=b
=
2-2a
•a
+b
2b
=12-2
•a b
∴2
•a
=1，b
∴|
+a
|=b
=
2+2a
•a
+b
2b
=1+1+1
，3
故答案为：3
搜题请搜索小程序“爱下问搜题”
已知|
|
∵|
|=|a
|=|b
-a
|=1，b
∴|
-a
|=b
=
2-2a
•a
+b
2b
=12-2
•a b
∴2
•a
=1，b
∴|
+a
|=b
=
2+2a
•a
+b
2b
=1+1+1
，3
故答案为：3