在10到20的自然数中,15既是奇数又是合数,把它写成几个质数相乘积的形式是什么?

60

1、甲乙两人生产一种零件,甲一天生产130个,乙一天生产的是甲的20倍,乙一天生产多 少 个 零 件?
2、甲乙两人生产一种零件,甲一天生产130个,乙一天生产的比甲的20倍少70个,乙一天生产多 少 个 零 件?
3、甲乙两人生产一种零件,甲一天生产130个,乙一天生产的比甲的20倍少70个,甲乙两人一天生产多 少 个 零 件?
4、一辆自行车的价格是190元,一辆电动车的价格是自行车价格的9倍,一辆电动车多少元?

5、一辆自行车的价格是190元,一辆电动车的价格是自行车价格的9倍,一辆电动车比自行车贵多少元?
6、一辆自行车的价格是190元,一辆电动车的价格是自行车价格的9倍 ,买一辆电动车和自行车共多少元?
7、水果店新购进105筐苹果,平均每筐重25千克,共购进苹果多少千克?
8、 一捆数学练习本有150本,学校为四年级 订了40捆,一共订了多少本?
9、一个因数是61,另一个因数是78,它们的积是多少?
10、小明走一步大约58厘米,他从家到学校共走了769步.他家到学校的距离大约是多少?
11、5元钱可以买两支圆珠笔,小明有25元钱,可以买几只同样的圆珠笔?

B1=if(AND(A1>=10,A120,A1

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4^32-1=(2^16+1)(2^16-1)
=(2^16+1)(2^8+1)(2^8-1)
=(2^16+1)(2^8+1)(2^4+1)(2^4-1)
=(2^16+1)(2^8+1)(2^4+1)(2^2+1)(2^2-1)
10-20之间的只有：2^4+1和2^4-1
即：15 17

60

29=10+19=11+18=12+17=13+16=14+15
如要满足任取7个数,其中每两个数的和均不能等于29,则10和19,11和18,12和17,13和16,14和15不能同时取到.除去这10个数,仅剩下20一个数.若不取20,要取7个数,则至少有两组,满足和等于29.若取20,在10个数中必须取6个,则至少有一组两个数同时取到,和等于29.
因此从10到20这11个自然数中,任取7个数,其中一定有两个数之和是29.

左边=a*(a+2)=a^2+2a
右边=(a+1)^2-1=a^2+2a+1-1=a^2+2a
所以,左边=右边
所以原式得证.

ten eleven tewlve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty

平方差公式：2^32-1=(2^16-1)(2^16+1)=（2^8-1)(2^8+1)(2^16+1)=(2^4-1)(2^4+1)(2^8+1)(2^16+1)=15*17(2^8+1)(2^16+1),所以是15和17

回答：
10 ten
11 eleven
12 twelve
13 thirteen
14 fourteen
15 fifteen
16 sixteen
17 seventeen
18 eighteen
19 nineteen
20 twenty

2的16次方-1
平方差
=(2^8+1)(2^8-1)
=（2^8+1)(2^4-1)(2^4+1)
能被15和17整除

15=3×5

2^48-1=(2^24+1)(2^24-1)
=(2^24+1)(2^12+1)(2^12-1)
=(2^24+1)(2^12+1)(2^6+1)(2^6-1)
=(2^24+1)(2^12+1)(2^6+1)(2^3+1)(2^3-1)
因为2^3+1=9,2^3-1=7
所以这两个数是9,7

ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty

=(5^2+1)(5^2-1)
=26×24
可以被12 13整除
26×24 ÷12得 26×2
26×24 ÷13得 2×24

一个,怎么又变两个,只有一个16

如果你是要翻译成英文的话：
1 please at 10 to 20 between say casually a number,you say how much can send few CARDS on the table.
2.Other don't need,and set aside
3.Please will you just said the number of ten with bits summarizations
4.Picked up these CARDS,from the top 1 of 1 card number to you just say that figure,bend

eleven. twelve. threeteen fourteen. fifteen. sixteen. seventeen. eighteen. nineteen. twenty thirty. forty. fifty. sixty. seventy. eighty. ninety. hundred

Dear Li Ming,
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You know we always become puzzled when we go to a new environment because we don’t know anything about the people around us and even don’t know what to do.I think you should make friends with the students in our class.Then if you have any problem you can ask us or our teachers for help.We’ll try our best to help you.
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10到20之间是包括10和20的.
我始终都认为10到20之间是包括10和20的,为什么,我问你,20和10之间有几个数,你别告诉你先用20减10再减2啊.还有,问你宿舍3楼101到109之间有几个房间,你别告诉我用109减101还减2.这不科学!

4*4*4-4=10

A1=INT( RAND()*10+10)+INT( RAND()*10)/10
A2=MOD((INT(A1)+INT(RAND()*9)+1), 10)+ INT(RAND()*10) /10+10
然后用A2向下填充A列,就是把A2单元格的填充柄向下拉