问题
填空题
已知|
|
答案
∵|
-a
|=2b
∴|
-a
| 2=b
2-2a
•a
+b
2=4b
∵|
|=|a
|=2b
∴4-2
• a
+4=4,可得b
•a
=2b
因此,可得|3
-2a
| 2=9b
2-12a
•a
+4b
2=36-24+16=28b
∴|3
-2a
|=b
=|3
-2a
| 2b
=228 7
已知|
|
∵|
-a
|=2b
∴|
-a
| 2=b
2-2a
•a
+b
2=4b
∵|
|=|a
|=2b
∴4-2
• a
+4=4,可得b
•a
=2b
因此,可得|3
-2a
| 2=9b
2-12a
•a
+4b
2=36-24+16=28b
∴|3
-2a
|=b
=|3
-2a
| 2b
=228 7