Question

把一張正方形的紙對(duì)折，再對(duì)折，這樣連續(xù)幾次，寫出對(duì)折了4次時(shí)長(zhǎng)方形的塊數(shù)是

 

塊．

Answer 1

分析：將一張對(duì)折一次時(shí)得到2個(gè)長(zhǎng)方形，對(duì)折二次時(shí)得到2×2=2²個(gè)長(zhǎng)方形，對(duì)折三次時(shí)得到2×2×2=2³個(gè)長(zhǎng)方形，依此類推即可得到對(duì)折四次時(shí)得到2×2×2×2=2⁴個(gè)長(zhǎng)方形．

解答：解：將一張正方形紙對(duì)折四次時(shí)得到：
2×2×2×2=16（個(gè)）．
答：對(duì)折4次有16長(zhǎng)方形．
故答案為：16．

點(diǎn)評(píng)：本題考查的是有理數(shù)的乘方，根據(jù)對(duì)折一次、兩次…得到的紙的層數(shù)，找出規(guī)律是解答此題的關(guān)鍵．