Question

 

(6分) 如圖①、圖②、圖③……是用圍棋子擺成的一列具有一定規(guī)律的“山”字．

(1)    按圖示的規(guī)律填空．

圖形標(biāo)號	①	②	③	④	……
圍棋子的數(shù)目(顆)	7

(2)   第n個圖形所對應(yīng)的圍棋子的數(shù)目為___________顆．

若某個圖形中有圍棋子142顆，它是第__________個圖形．

 

Answer 1

 

(1) 12，17，22

(2)  

(3) 28

解析:

解：(1) 12，17，22···················································································· 3分

(2) ·················································································· 5分

(3) 28·························································································· 6分