问几个数学问题,我有8百分 是填空题和判断,好的追加200分

2025-03-26 02:32:40
推荐回答(5个)
回答1:

1、根据题意,这筐装满后苹果的重量=已有的苹果重量*2+6=18*2+6=42千克
2、根据题意,小数部分*4=2.16,那么小数为2.16/4=0.54
整数部分-小数部分=4.46,那么整数部分=4.46+0.54=5
综上该数为5.54
3、很容易分析出整数部分百位为一,个位为二,能被三整除的数有个特点就是,每一位的数相加是三得的倍数,那么三位数中最小的三的倍数就是102了,这个数就是102.102
4、根据题意,这个数必须满足两个条件,一个是各个位数的数字相加是3的倍数,还有一就是个位必为5,如果是三位数最小的就是335,但是不能被3整除,四位数就有3335、3355、3555三个选择,根据条件筛选,就是3555
5、显然a、b、c、d分别为2、5、3、7,这四个数都是质数,这四个数的最小公倍数是210。但是这并不能应用于所有情况,如果有合数的话,就不一定了。
6、都写出来,16的约数有1、2、4、8、16,
24的约数有1、2、3、4、6、8、12、24
数一下就出来啦
2和3; 4和3; 8和3; 16和3 共四对
7、这道题的思路是这样的,个位是8,那么这两个数的个位相乘得出来的数的个位是八,要求互质,那么就有个位可能分别是1和8,2和9,3和6(不要认为有3和6就都是3的倍数哦),4和7
但是这两个数又必须是合数,那么
a、1和8:21、81、111、121,再往上数更是不可能,因为含一的都数的百位了,而两者相乘只有858;
b、2和9:12、22、32、42、52、62、72都不行,这一组也没有
c、3和6:6和143互质
d、4和7:4、14、24、34、44...27、57都不行,这组也没有
综上,只有一对
8、10以内质数有2、3、5、7
首先排除(2、3、5)、(2、5、7)的组合,因为三个数相加不是3的倍数,
再排除2、3、7的组合,因为不能成为5的倍数,
那么就只有3、5、7的组合了,能被5整除,个位为5,就有375和735,两个数

希望能帮到你,做数学题一定要多思考,不是光做题,做错的要反思,做对的也要多看,熟练掌握。
我是希望给你提供思路,答案可能有错,还请见谅了!

回答2:

1.42
2.5.54
3.102.012
4.
5.对
6.10
7.2
8.2

回答3:

1. 60
2. 5.54
3. 102.21(不晓得百分位上是最小分数是什么意思,应该是1吧)
4.3555
5.错的
6.15对
7.无数对
8.1个(375)

回答4:

1.42
2.5.54
3.102.012
4.
5.对
6.10
7.2
8.2
好了

回答5:

1.42
2.5.54
3.102.012
4.3555
5.对
6.4对
7.1
8.2

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