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题型:综合题 题类:常考题 难易度:困难
广东省东莞市虎门捷胜中学2016-2017学年七年级下学期数学期中考试试卷
2 = ,验证:2 = = = = ;
3 = ,验证:3 = = = = .
= = = = -1,
请用上述方法化简:
①
②;
③
……
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