问题:
有一边长为1的正方形ABCD,
AB
=
a
,
BC
=
b
,
AC
=
c
,则 |
a
-
b
+
c
|=______.
有一边长为1的正方形ABCD,
=
,
=
,
=
,则 |
-
+
|=______.
AB |
a |
BC |
b |
AC |
c |
a |
b |
c |
参考答案: