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Mathematics requires a set of test questions.
12、Cu(AUB)=(-a- 1,a+2)

Copper (AUB) is contained in c.

-a- 1 & lt; 0a & gt; - 1

a+2 & gt; = 4a & gt; =2

Existence, the value range of a:

b={x|x^2-4<; 0}=(-2,2)

A∩B=

(2)CRA=(-∞, 1/2)U(3,+∞)

b={x|x^2<; -a}=(-√(-a),√(-a))

(CuA)∩B=B

√(-a)& lt; 1/2

-a & lt; 1/4

a & gt- 1/4

Or-√ (-a) > three

-a & gt; nine

a & lt-9

The range of a is (-∞, -9)U(- 1/4,+∞).