(1) 4≤X^2≤9 (2) 1≤4-a^2≤4(1) 4≤X^2≤9(2) 1≤4-a^2≤4

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(1) 4≤X^2≤9 (2) 1≤4-a^2≤4(1) 4≤X^2≤9(2) 1≤4-a^2≤4

(1) 4≤X^2≤9 (2) 1≤4-a^2≤4(1) 4≤X^2≤9(2) 1≤4-a^2≤4
(1) 4≤X^2≤9 (2) 1≤4-a^2≤4
(1) 4≤X^2≤9
(2) 1≤4-a^2≤4

(1) 4≤X^2≤9 (2) 1≤4-a^2≤4(1) 4≤X^2≤9(2) 1≤4-a^2≤4
(1)
2

-3<=x<=2或2<=x<=3
-sqrt(3)<=a<=sqrt(3)

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