
(a+1)2 |
2 |
(a−1)2 |
2 |
可得-
(a−1)2 |
2 |
(a+1)2 |
2 |
(a−1)2 |
2 |
解得 2a≤x≤a2+1,
∴A=[2a,a2+1].
解不等式x2-3(a+1)x+2(3a+1)≤0可得,
(x-2)[x-(3a+1)]≤0,
∴B={x|(x-2)[x-(3a+1)]≤0},
由A⊆B,如图所示:
可得
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解得 1≤a≤3,或 a=-1,故a的取值范围为 {a|1≤a≤3,或 a=-1 }.
(a+1)2 |
2 |
(a−1)2 |
2 |
(a+1)2 |
2 |
(a−1)2 |
2 |
(a−1)2 |
2 |
(a+1)2 |
2 |
(a−1)2 |
2 |
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