Dịch : Cho biết 1400 = 2a x 5b x 7c. Tìm giá trị của a + b + c.
Giải :
- Phân tích 1400 ra thừa số nguyên tố, ta có :
1400 = 23 x 52 x 71
=) a = 3; b = 2 và c = 1.
- Ta có : 3 + 2 + 1 = 6.
Vậy giá trị của biểu thức là 6.
given that m=999...9} 2016 dilgits
n=555...5}2016 dilgits
find the sum of the dilgits in the value m x n
8.Find the value of 1+2+3+4+5+...+2016+2017+2016+2015+...+3+2+1.
Câu 1 :Each of cars can take 8 people. How many cars needed to take 124 people?
Câu 2 : How many integer numbers between 200 and 300 are there for which the hundreds digit equals the sum of the other two digits?
Câu 3 : The average of five numbers is 20. The average of the five number is 18 when one of the numbers is chaned to 4. What is the orginal value of the changed number?
Câu 4 :A book has 250 pages starting at number 1. How many digits are there in the page numbers of the book?
Câu 5 : Find A, if A is 3 less than the average of 48; 55; 29 and A. The value of A is…
Câu 6 : The sum of denominator and numerator of a fraction is 121 and the fraction is equal to 4/7. Find the denominator of the fraction?
Câu 7 : The sum of two numbers is equal to 77. If the first number is multiplied by 8 and the second by 6, the two product are equal. The larger of these numbers is…
Câu 8 : Which is the greatest 2 - digit number divisible by 2, 3 and 4?
Câu 9 : Calculate: (1 + 2/5) x 6/7.
Câu 10 : Give the number sequence: 1, 4, 7, 10, 13, … Find the 15th term of the number sequence.
Câu 31:
Given that the set .\(A=\left\{x\in N\left|x⋮3,2\le x\le999\right|\right\}\)
How many elements are there in the set A?
Answer: ...
find the value of:
\(\dfrac{1}{3}\)+\(\dfrac{1}{6}\)+\(\dfrac{1}{10}\)+\(\dfrac{1}{15}\)+\(\dfrac{1}{21}\)+...+\(\dfrac{1}{300}\)
Toán tiếng anh:
Several different numbers are written on the board. Exactly two them are divisible by 3 and exactly 9 of them are divisible by 13. Let M be the greatest of these numbers. What is the smallest possible value of M?
The sum of four natural numbers is 1111. Find the largest possible values of highest common factor of these four numbers.
