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【简答题】
（1）若函数y=f（2x+1）的定义域为[1，2]，求f（x）的定义域． （2）已知函数f（x）的定义域为[- 1 2 ， 3 2 ]，求函数g（x）=f（3x）+f（ x 3 ）的定义域．
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