The first 100 positive even numbers are 2; 4; 6;...; 200. Their sum is \(\dfrac{\left(200+2\right).100}{2}=10100\).
The first 100 positive odd numbers are 1; 3; 5;...; 199. Their sum is \(\dfrac{\left(199+1\right).100}{2}=10000\)
The difference between two sums is \(10100-10000=100\)
giúp mình với :
1.the sum of the 1st number is 1223, the 2nd is 1329, the 3rd is 9637. Know that the first and second numbers are odd and the other is even. Find those 3 numbers?
The difference between two numbers is 3. Their sum is 33. What are the two numbers?
Answer: The two numbers are .
(write your answer in order from least to greatest and use ";" between the numbers)
In a number sequence : 1 , 1 , 2, 3 , 5 , 8 , 13 , 21 , ... , starting from the third number , each number is the sum of the two numbers that come just before it . How many even numbers are there among the first 1000 numbers in the number sequence ?
How many positive three-digits numbers are there in which the sum of the digits is old?
Trình bầy cách giải thì mới đc chọn
Which number between 70 and 80 can be expressed both as the sum of two consecutive natural numbers and as the sum of three consecutive natural numbers?
Which number between 70 and 80 can be expressed both as the sum of two consecutive natural numbers and as the sum of three consecutive natural numbers?
Which number between 70 and 80 can be expressed both as the sum of two consecutive natural numbers and as the sum of three consecutive natural numbers?
Which number between 70 and 80 can be expressed both as the sum of two consecutive natural numbers and as the sum of three consecutive natural numbers?
Which number between 70 and 80 can be expressed both as the sum of two consecutive natural numbers and as the sum of three consecutive natural numbers?
