|2a+b|+|2a-b| |
|a| |
|2a+b|+|2a-b| |
|a| |
|2a+b+2a-b| |
|a| |
|4a| |
|a| |
|2a+b|+|2a-b| |
|a| |
|2a+b|+|2a-b| |
|a| |
|2a+b|+|2a-b| |
|a| |
|2a+b|+|2a-b| |
|a| |
|2a+b|+|2a-b| |
|a| |
π |
4 |
1 |
a |
4 |
b |
A.(-∞,1)∪(3,+∞) | B.(1,3) |
C.(-∞,-3)∪(-1,+∞) | D.(-3,-1) |
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