植樹(shù)問(wèn)題 (2)課件

學(xué)校操場(chǎng)邊有9棵樹(shù)排成一行，為了美化校園環(huán)境，每相鄰的兩棵樹(shù)之間擺一盆花，頭和尾都不擺花，一共可以擺多少盆花？植樹(shù)問(wèn)題(2)學(xué)校操場(chǎng)邊有9棵樹(shù)排成一行，為了美化校園環(huán)境，每相鄰的兩棵樹(shù)之間擺一盆花，頭和尾都不擺花，一共可以擺多少盆花？？間隔數(shù)：9-1=8（個(gè)）花盆數(shù)：1×8=8（盆）植樹(shù)問(wèn)題(2)

假如1000棵樹(shù)排成一行，每相鄰兩棵樹(shù)之間擺一盆花，頭和尾都不擺花，一共可以擺多少盆花？間隔數(shù)：1000-1=999（個(gè)）花盆數(shù)：1×999=999（盆）植樹(shù)問(wèn)題(2)

假如1000棵樹(shù)排成一行，每相鄰兩棵樹(shù)之間擺一盆花，頭和尾都擺花，一共可以擺多少盆花？間隔數(shù)：1000+1=1001（個(gè)）花盆數(shù)：1×1001=1001（盆）植樹(shù)問(wèn)題(2)間隔數(shù)=樹(shù)的棵樹(shù)=1000（個(gè)）花盆數(shù)：1×1000=1000（盆）

假如1000棵樹(shù)排成一行，每相鄰兩棵樹(shù)之間擺一盆花，開(kāi)頭擺花，而末尾不擺，一共可以擺多少盆花？植樹(shù)問(wèn)題(2)

假如36棵樹(shù)排成一行，每相鄰兩棵樹(shù)之間擺4盆花，頭和尾都不擺花，一共可以擺多少盆花？間隔數(shù)：36-1=35（個(gè)）花盆數(shù)：4×35=140（盆）植樹(shù)問(wèn)題(2)想一想：生活中還有什么事情與“擺花盆問(wèn)題”類似，可以用“對(duì)應(yīng)”的方法來(lái)解決？植樹(shù)問(wèn)題(2)植樹(shù)問(wèn)題路燈問(wèn)題鋸木問(wèn)題排隊(duì)問(wèn)題爬樓問(wèn)題分別找一找下面問(wèn)題中誰(shuí)與誰(shuí)是“對(duì)應(yīng)”的？植樹(shù)問(wèn)題(2)植樹(shù)問(wèn)題路燈問(wèn)題鋸木問(wèn)題排隊(duì)問(wèn)題爬樓問(wèn)題想一想：這些問(wèn)題有什么共同特點(diǎn)？植樹(shù)問(wèn)題(2)樹(shù)的棵數(shù)與間隔數(shù)相“對(duì)應(yīng)”。植樹(shù)問(wèn)題(2)路燈數(shù)與間隔數(shù)“對(duì)應(yīng)”。植樹(shù)問(wèn)題(2)人數(shù)與間隔數(shù)“對(duì)應(yīng)”。植樹(shù)問(wèn)題(2)樓層數(shù)與間隔數(shù)“對(duì)應(yīng)”。1樓4樓3樓2樓植樹(shù)問(wèn)題(2)鋸1次鋸2次鋸3次鋸