应用题。急急急急急急急急急!!!!!!!!!!!!!!!!!!各位大神帮帮忙!

2025-01-24 06:28:51
推荐回答(3个)
回答1:

1、园林工人在一段公路的两边每隔4米栽一棵树,一共栽了74棵。现在要改成每隔6米栽一棵树。那么,不用移栽的树有几棵?
解:
74÷2=37(棵) 两边74棵,一边就是37棵
37-1=36 (棵) 因为头尾都栽的,所以减去1,就是36个间隔
36×4=144(米) 36个间隔,每个间隔4米,这条路共长144米。
4和6的最小公倍数是12
144÷12=12 144米中有12个12的倍数
12+1=13(棵) 再加上最后的1棵,一边就是13棵不要移动
13×2=26(棵) 两边一共有26棵不要移动。

2、张大伯卖了一天的水果,晚上数钱时,他发现手头的一叠纸币是一些贰元的和伍元的。张大伯把这叠钱分成钱数相等的两堆,第一堆中五元和二元的钱数相等,第二堆中五元和二元的张数相等。你知道这一叠纸币至少有多少元吗?

两堆钱数量相同,第一堆钱的条件是钱数相同,显然,2元和5元各有的钱数的最小值就是2和5的最小公倍数10,第一堆钱最少要10×2=20元,而第二堆钱的特征是数量相等,那么第二堆钱的最小值就是5+2=7元(1张5元,1张2元)而第二堆和第一堆钱数相等,那么,两堆钱的最小值就是他们的20和7的最小公倍数20×7=140元,两堆钱最少是140+140=280元。

回答2:

1 先算这条公路的长度,
先算出一边栽树74除以2=37棵,一共有37-1=26(间距)
这条公路的长度是36*4=144米
现在得找4和6在144里的公倍数,4和6的公倍数有:12,24,36,48,60,72,84,96,108,120,132,144,一共有12个
公倍数代表的位置的树是不需要移栽的,再加上最开始的一棵树,一边不用移栽的树有12+1=13棵,两边一共不是13*2=26棵

回答3:

4*(74/2-1)=144棵
4和6的最小公倍数为12
(144/12+1)*2=26棵 不用移栽的树有26棵
2*5*2+1*5+1*2=27元

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