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（本题满分10分） （1）（本小题满分4分） — + （2）（本小题满分6分）已知：y＝y 1 ＋y 2 ，y 1 与x 2 成正比例，y 2 与x成反比例，且 x＝1时，y＝3；x＝-1时，y＝1. 求x＝- 时，y的值．
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