Mình đã tìm ra cách giải của bài toán này như sau:
Ta có: 2 người: 1 cái bắt tay
3 người: 3 cái bắt tay
4 người: 6 cái bắt tay
................................
24 - (4x3) :2 =18
The 8 people at a party are 4 couples. Each man shakes hands with everyone else except his own wife. No two women shake hands with each other. What is the total number of handshakes among thes 8 people?
The people 8 couples.Each man shakes hands with everyone else except his own wife.No two women shake hands with each other .What is the total number of handshakes among these 8 people ?
giai loi bai toan bang tieng viet gium minh minh tang ban 1 like
the 8 people at a party is a couple.each one shack hands with every one else except his own wife.No two woman shack hands with each other.what is the total number of hand shackes among these8 people
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 ?
Câu 2:
Mathematician Sophie Germain worked with codes and mathematics. If each letter of the alphabet is assigned a number starting with A = 1, B = 2, etc., the values of the letters in the alphabet will start to look like this:
If your code is sum of the letter values, what is the value of "MATH" ?
Answer:
Câu 3:
What is the next number in the pattern: 25, 23, 21, 19, 17, ...?
Answer:
Câu 4:
A farmer plants 450 seeds per row in his field. How many FULL ROWS would he be able to plant with 50000 seeds?
Answer:
Câu 5:
Your school is having a canned food drive for Harvesters. How many total cans would you have if you made a solid pyramid with cans on the first level, on the second level and continue the pattern all the way up to just one can on top?
Answer: cans.
Câu 6:
Examining the operation of how to use the number of days to find the number of beans in a classroom jar is shown the table. On day 31, how many beans would be in the jar?
Answer: beans.
Câu 7:
The 112 4-grade students at Edgemont School donate pennies to raise 75 dollar for a local charity. What is the minimum number of pennies each student needs to bring if they are to meet their goal of collecting 75 dollar?
(1 dollar = 100 pennies)
Answer: pennies.
Câu 8:
Use the table of values to help you find the value of 9 feet in inches.
Answer:
Câu 9:
Joel is three years younger than his brother Jaime. The sum of their ages is fifty-five. How old is Joel?
Answer: years old.
Câu 10:
Calculate:
Câu 1:
How many apples would you get from the 10th tree if a farmer notices a pattern from picking the apples on the 1st through the 10th tree. He picked 4 from the first tree, 7 from the second tree and 10 from the third tree.
Answer:
Câu 2:
If you make the 8000km trip, about how much would it cost at today's prices of 3.00 dollar per liter of gas when your car gets 25km per liter?
Answer: dollar.
Câu 3:
What is the next number in the pattern: 25, 23, 21, 19, 17, ...?
Answer:
Câu 4:
A farmer plants 450 seeds per row in his field. How many FULL ROWS would he be able to plant with 50000 seeds?
Answer:
Câu 5:
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)
Câu 6:
Your school is having a canned food drive for Harvesters. How many total cans would you have if you made a solid pyramid with cans on the first level, on the second level and continue the pattern all the way up to just one can on top?
Answer: cans.
Câu 7:
Use the table of values to help you find the value of 9 feet in inches.
Answer:
Câu 8:
The 112 4-grade students at Edgemont School donate pennies to raise 75 dollar for a local charity. What is the minimum number of pennies each student needs to bring if they are to meet their goal of collecting 75 dollar?
(1 dollar = 100 pennies)
Answer: pennies.
Câu 9:
If n2 =n.n and n3=n .n.n , what is the value of 34 ?
Answer:
Câu 10:
Calculate:1/10 +2/10+3/10+4/10+5/10+6/10+7/10+8/10+9/10+55/10
Các bạn giải nhanh dùm mình nha ^_^ mình đang cần gấp :*
.
âu 1:
If Juan spent of his money on a game that costs 20 dollar, how much did Juan have originally to spend?
Use the diagram below to reason the answer.
Answer: dollar.
Câu 2:
Mathematician Sophie Germain worked with codes and mathematics. If each letter of the alphabet is assigned a number starting with A = 1, B = 2, etc., the values of the letters in the alphabet will start to look like this:
If your code is sum of the letter values, what is the value of "MATH" ?
Answer:
Câu 3:
It takes Abby twice as long as Blair and half as long as Caitlin to ride her bike to school. If it takes Blair 10 minutes to ride her bike to school, how long does it take Caitlin to go to school?
Answer: minutes.
Câu 4:
If you make the 8000km trip, about how much would it cost at today's prices of 3.00 dollar per liter of gas when your car gets 25km per liter?
Answer: dollar.
Câu 5:
Examining the operation of how to use the number of days to find the number of beans in a classroom jar is shown the table. On day 31, how many beans would be in the jar?
Answer: beans.
Câu 6:
The 112 4-grade students at Edgemont School donate pennies to raise 75 dollar for a local charity. What is the minimum number of pennies each student needs to bring if they are to meet their goal of collecting 75 dollar?
(1 dollar = 100 pennies)
Answer: pennies.
Câu 7:
What is the value of the following expression: ?
Answer:
Câu 8:
Your school is having a canned food drive for Harvesters. How many total cans would you have if you made a solid pyramid with cans on the first level, on the second level and continue the pattern all the way up to just one can on top?
Answer: cans.
Câu 9:
What is the next number in the pattern: 1, 8, 27, ...?
Answer:
Câu 10:
If your parents give you one penny on Day 1, 2 pennies on Day 2, 4 pennies on Day 3, 8 pennies on Day 4. If the pattern continues, how many pennies will your parents give you on Day 15?
Answer: pennies.
there are four kids .if we compute the total age of three of them at a time ,the sum are 22,20,17,25.what is the different of age between the oldest and the youngest among these four kids
there are four kids.If we compute the total ages of three of them at a time, the sums are 22,20,17,25 respectively. What is the difference in age between the oldest and the youngest among is four kids.
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