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找规律数列的变化规律,想一想、找一找:,1,5,9,13,17,规律:每相邻的两项的差是4,21,25,27,24,21,18,12,15,9,规律:每相邻的两项的差是3,1,2,3,4,5,6,规律:每相邻的两项的差是1,1,2,4,7,11,例,做一做:,2,4,8,14,22,(),44,58,32,课堂检测,1,4,7,10,13,16,19,22,25,28,+2,+3,+4,+5,+6,2,3,5,8,12,17,_,6,23,接着画珠子:,5,5个一,50,5个十,500,5个百,5000,5个千,1,1,2,3,5,8,21,96,12,6,3,提升练习:,24,13,48,4 4,16,