a) Số thứ 24 bắt đầu từ số 16 là:
(24-1)x1+16=39
Tổng các số từ 16 đến 39 là:
(39+16)x(24:2)=660
b) Dãy các số lẻ từ 100 đến 200 bắt đầu từ số 101 đến số 199.
Có số số thỏa mãn đề bài là:
(199-101):2+1=50(số)
Tổng của các số thỏa mãn yêu cầu đề bài là:
(199+101)x(50:2)=7500
đ/s
P/s: bạn thông cảm, mình không giải bằng tiếng anh được :V
There are two even numbers whose sum is 3986 and there are 5 odd numbers between them.
a) Find the greater number. Give your answer only.
b) Find the smaller number. Give your answer only.
Câu hỏi 1:
The average of three numbers is 1988. The first number is 1984. The third number is 2 units more than the second number. Find the third number.
Câu hỏi 2:
The average of 5 consecutive odd numbers is 123. Find the greatest number.
Câu hỏi 3:
Which of the following fractions is equal to 2/3?
Câu hỏi 4:
The average of two numbers is 95. The first number is 2/3 of the second number. Find the first number
Câu hỏi 5:
Fill in the blank with the correct number: 6/100 kg = .... kg
Câu hỏi 6:
The sum of two fractions is 45/23 and the first fraction is one quarter of the second fraction. Find the first fraction.
Câu hỏi 7:
The sum of twonumbers is 463 and three are eighteen even numbers between these numbers. Find the greater number.
Câu hỏi 8:
Which of the following fractions is the greatest number?
Câu hỏi 9:
The average of two numbers is 95. The first number is 2/3 of the second number. Find these two numbers.
Câu hỏi 10:
The sum of the number of lions and monkeys in a zoo is 40 and lions are 1/3 the number of monkeys. How many monkeys are there in the zoo?
Jack writes the consecutive natural numbers from 1 to 10 on a board. If he erases some of the numbers and adds up the remaining ones then he will get a sum of 30. The number of numbers that is erased on the board at most is
Jack writes the consecutive natural numbers from 1 to 10 on a board. If he erases some of the numbers and adds up the remaining ones then he will get a sum of 30. The number of numbers that is erased on the board at most is
Jack writes the consecutive natural numbers from 1 to 10 on a board. If he erases some of the numbers and adds up the remaining ones then he will get a sum of 30. The number of numbers that is erased on the board at most is ......
Jack writes the consecutive natural numbers from 1 to 10 on a board. If he erases some of the numbers and adds up the remaining ones then he will get a sum of 30. The number of numbers that is erased on the board at most is
Jack writes the consecutive natural numbers from 1 to 10 on a board. If he erases some of the numbers and adds up the remaining ones then he will get a sum of 30. The number of numbers that is erased on the board at most is
Jack writes the consecutive natural numbers from 1 to 10 on a board. If he erases some of the numbers and adds up the remaining ones then he will get a sum of 30. The number of numbers that is erased on the board at most is
Jack writes the consecutive natural numbers from 1 to 10 on a board. If he erases some of the numbers and adds up the remaining ones then he will get a sum of 30. The number of numbers that is erased on the board at most is
