图形中的规律 (2).ppt

北师大版 五年级上册 数学好玩,像笑笑这样摆10个三角形需要多少根小棒？,3,5,7,9,1,2,3,11,13,15,17,19,21,3,32,32×2,32×3,32×4,32×5,32×6,32×7,32×8,32×9,3,2×31,3×32,4×33,5×34,6×35,7×36,8×37,9×38,10×39,12,12×2,12×3,12×4,12×5,12×6,12×7,12×8,12×9,12×10,笑笑接着摆下去，一共用了37根小棒，你知道她摆了多少个三角形吗？,37334,34÷217,17118,37136,36÷218,观察每个点阵中点的个数，你发现了什么？,1×1,1,2,3,2×2,3×3,4×4,5×5,13,135,1357,1,121,12321,1234321,1,