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Câu hỏi toán Tiếng anh
1.A book consists of 396 pages.How many digits do we need to type all page number of that book?
2.Given five digits 0,1,2,3,4.How many 4-digit numbers can be formed using those digits?
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Find the number of 3-digit positive numbers that have product of digits equals to 21.
Câu 9:
Three different positive integers and are such that .
What is the value of ?
Answer:
Câu 10:
Of the numbers 1,2,…,1000, how many numbers are divisible by neither 6 nor 9?
Answer:
I add up all even number between 1 and 101. Then from my total I subtract all odd numbers between 0 and 100. What is the result?
It is known that n is a 10-digit number of the form 2017x2018y, where x and y can be any integer 0 to 9. How many such numbers n are there that are divisible by 33?
DỊCH
. Biết rằng n là số có 10 chữ số có dạng 2017x2018y, trong đó x và y có thể là các số nguyên từ 0 đến 9. Có bao nhiêu số n như vậy chia hết cho 33?
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Find the value of n, if the sum of even positive integers between n2 - n + 1 and n2 + n + 1 is a number between 2500 and 3000
Between which pair of whole numbers does the square root of 45 lie?
The tenths digit in the number 23453,213 is ...
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A rectangular tank with a square base of side 5 metres contains water to adepth of 4 metres. A solid cube of edge 3 metres is placed at the bottom of a tank. The level of water in the tank, in metres, rises to ____________ (Input the answer as a decimal in its simplest form)