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题型:填空题 题类:常考题 难易度:普通
重庆市江津实验中学2018-2019学年八年级下学期数学第一次月考试卷
则 =.
=1﹣ , = ﹣ , = ﹣
将以上三个等式两边分别相加得: + + =1﹣ + ﹣ + ﹣ =1﹣ =
=1;
= =2;
= =3;
= =4.
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