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2019年春七年级数学下册第五章相交线与平行线本章中考演练课件（新版）新人教版.pptx

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第五章 相交线与平行线,9.( 金华中考 )如图,已知l1l2,直线l与l1,l2相交于C,D两点,把一块含30角的三角尺按如图位置摆放.若1=130,则2= 20 .,

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