(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≤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
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