Question 1:What number should be placed in the box to make ?Answer: Question 2:What is the remainder when 65870 is divided by 8?Answer: Question 3:The expression is equal to Question 4:Mya has 10000 dollars in bills of 40 dollars.How many 40 dollars- bills does she have? Answer: 40 dollars- bills.Question 5:The numbers from 1 to 1000 are written. How many of these numbers have at least two digits 5?Answer: numbers.Question 6:Five years ago, Sarah was 7 years old. Two years later, she will...
Đọc tiếp
Question 1:
What number should be placed in the box to make ?
Answer:
Question 2:
What is the remainder when 65870 is divided by 8?
Answer:
Question 3:
The expression is equal to
Question 4:
Mya has 10000 dollars in bills of 40 dollars.How many 40 dollars- bills does she have?
Answer: 40 dollars- bills.
Question 5:
The numbers from 1 to 1000 are written. How many of these numbers have at least two digits 5?
Answer: numbers.
Question 6:
Five years ago, Sarah was 7 years old. Two years later, she will be years old.
Question 7:
Six students had an orange eating contest. The graph shows the number of oranges eaten by each student. Mary ate the fewest oranges and Jack ate the fewest. How many more oranges did Jack eat than Mary?
Answer: oranges.
Question 8:
A large box of candies and a small box of candies together cost 13 dollars. If the large box costs 5 dollars more than the small box, what is the price of the small box of candies?
Answer: dollars.
Question 9:
Five students do an exam with a maximum score of 50. The scores of four of the students are 41, 44, 46 and 49. The average of five students’ scores is the same as the score of the fifth student. The score of the fifth student is
Question 10:
A fraction is equal to . The sum of its denominator and its numerator is 91. What is the difference between the denominator and numerator of this fraction?
Answer:
55 được 1 số
- Tính các số có ba chữ số có ít nhất 2 chữ số 5:
TH1: a55 có 8 số vì a không chọn 0 và 5
TH2: 5a5 có 9 số vì a không chọn 5
TH3: 55a có 9 số vì a không chọn 5
số cuối cùng là 555
Vậy có tất cả"
1 + 8 + 9 + 9 + 1 = 28 số
(1000-5):5+1=200 số