题目内容
已知实数a,b在数轴上的位置如图所示:试化简
-
-
.
(a+
|
(b-2
|
a2-2ab+b2 |
根据数轴可知:-3<a<-2,4<b<5,
∴a<-
,b>2
,a-b<0,
∴
-
-
=|a+
|-|b-2
|-|a-b|
=-(a+
)-(b-2
)-[-(a-b)]
=-a-
-b+2
+a-b
=
-2b.
∴a<-
3 |
3 |
∴
(a+
|
(b-2
|
a2-2ab+b2 |
=|a+
3 |
3 |
=-(a+
3 |
3 |
=-a-
3 |
3 |
=
3 |
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