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2019年春八年级数学下册第19章四边形周滚动练（19.3_19.4）课件（新版）沪科版.pptx

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周滚动练(19.319.4),( 2 )猜想:图n中菱形的总个数an= 3( n-2 )或3n-6 ( n3 ); ( 3 )直接写出图n的面积Sn= 3 n .,

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