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2018秋八年级数学上册期末复习3二元一次方程组和数据的分析习题课件（新版）北师大版.ppt

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期末复习3 (二元一次方程组和数据的分析),2,1,无数,2,公共解,一,代入法，加减法等,“消元”,一元一次方程,x1x2xn,加权平均数,最中间,最中间,最多,中位数,集中,最大值和最小值,标准差,波动,A,C,C,C,D,A,如3x2y1等,22,14,2015,345,24,

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