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题型:综合题 题类:模拟题 难易度:困难
山西省阳泉市郊区2019年中考数学一模考试试卷
① = ;
② = ;
③ = .
验证: = = = ;
= = = ;
= = = .
将以上三个等式两边分别相加得: + + =1﹣ + ﹣ + ﹣ =1﹣ = .
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