2018_2019学年七年级数学上册第三章整式及其加减3.5探索与表达规律课件(新版)北师大版.ppt

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5 探索与表达规律,1.在日历表中,左右相邻的两个日期是两个 整数. 2.在日历表中,上下相邻的两个日期中,上面的比下面的 . 3.从2开始,将连续的偶数相加,其和的情况如下:2=12,2+4=6=23,2+4+6=12=34,2+4+6+8=20=45,2+4+6+24= = ,将从2开始n个连续的偶数相加,试写出用n表示的代数式2+4+6+2n= .,连续,小7,156,12,13,n(n+1),1,2,3,4,答案,1.观察下列各图形中小正方形的个数,依此规律,第(11)个图形中小正方形的个数为( ).A.78 B.66 C.55 D.50,1,2,3,4,答案,2.(2017山东日照中考)观察下面“品”字形中各数之间的规律,根据观察到的规律得出a的值为( ).,A.23 B.75 C.77 D.139,1,2,3,4,答案,3.如图,用相同长度的小棒摆成一组有规律的图案,图案(1)需要4根小棒,图案(2)需要10根小棒按此规律摆下去,第n个图案需要小棒 根(用含有n的代数式表示).,1,2,3,4,答案,4.如图是用围棋棋子摆成的一列具有一定规律的“山”字.则第n个“山”字中的棋子个数是 .,

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