If 3 / x = 1 / y = 4 / Z and XY + XZ + YZ = 76, find the value of 2 (square of x) + 12 (square of Y) + 9 (square of Z) Although it does seem wordy, you can still understand it if you look at it carefully,

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• 1. Summer homework of mathematics in grade one of junior high school 1. The square of X + the square of Y - 8x - 10Y + 41 = 0, find the value of X / y + Y / X 2. Square of X + square of Y - 6x - 4Y + 13 = 0, find the value of (x + y) to the power of 2008
• 2. Write a paragraph under the title of "what is happiness", within 150 words
• 3. Fifth grade volume two summer vacation study companion p135 wide angle ability, such as the topic The second question has a cuboid, 24 long, 12 wide and 6 high (unit: cm). Now cut it into two identical cuboids. The third question: how many square centimeters can the surface area increase at most?
• 4. Happy summer vacation I counted more than 20 horses
• 5. Grade 6 winter vacation study companion 19 pages Lujiang Publishing House Domestic automobile brand de logo de production area [5 kinds] Maritime traffic in Xiamen—— Air traffic—— Land transportation—— My feelings——
• 6. Fill in the appropriate number in the box, and then write the horizontal answer
• 7. Du Fu loved reading since he was a child. At the age of seven, he was familiar with the famous works of the poets of the previous generation and the contemporary. He not only read them well, but also recited them by cover. Some books he read repeatedly had been confused. He was fascinated by reading and often forgot to eat. Du Fu studied hard, More than ten years have laid a good foundation for his future business. When he saw some excellent works, he loved them and read them again and again until he could recite them Sorting questions
• 8. Moon girl makes clothes
• 9. I'll help you with your composition on page 21 of summer homework in Volume 2 of grade 4 of Jiangsu Education Press On the eve of teacher's day, teacher Zhou, the head teacher of class 2, grade 4, received a letter without head or tail. As soon as he saw the handwriting, he knew it was written by Li Fangfang. Look at the missing parts of the letter and help her fill them up. Tomorrow is teachers' day. I'll give you this small gift. But my mother said, I'm careless, often do wrong questions, give you a lot of trouble, correct this shortcoming, is to give the teacher the best gift. teacher,
• 10. Composition (300 words) in unit 3 of Chinese Volume II of PEP for primary school students of grade 4 in 2011
• 11. 1、 It is only a formula, not a calculation 1. The third grade students plant trees. There are 50 students in the first class, with an average of 3 trees per person. There are 55 students in the second class, with a total of 165 trees. How many trees per person in the third grade? 2. Mr. Wang deposits 5000 yuan in the bank for three years at an annual interest rate of 2.4%. When it comes to maturity, how much is the total amount of principal and interest after deducting the interest tax (20%)? 3. Mingmingjia plans to spend 800 yuan in May, but the result is 950 yuan. How much is the overrun? 4. The price of a garment will be 80 yuan after 20% price reduction. How much is the original price? 7. The income of wheat in Jingcheng Township this year is 5% higher than that of last year, just 60 tons higher than that of last year. How many tons of wheat in Jingcheng Township last year? 2、 Practical questions 1. The fruit shop has 1500 kg of fruit, and the pear is three fifths of the apple, and the pear is three fourths of the peach. How many kg are the peaches? 2. The number of goats is 200 less than that of sheep. The number of goats is 60% of that of sheep. How many goats and sheep are there respectively 3. In one way, team a and team B cooperate for 10 days, and team a can complete it by himself for 30 days. After 4 days of cooperation, team a is taken away because of something, and the rest is completed by team B. how many days will it take team B to complete the task?
• 12. For a project, it takes a day for Party A to finish it alone, and it takes B day for Party B to finish it alone. For Party A and Party B to cooperate for 5 days, how many parts of the project can be completed? Regard the project as unit 1
• 13. When I solve the applied problems of mathematical engineering problems, I know the equivalent relation, but I can't make equations. What should I do?
• 14. Typical problems in practical engineering problems For a project, it takes 20 days for team a to do it alone, and 12 days for team B to do it alone. It is known that team a has done the project for several days, and then team B has continued to complete it. It takes 14 days from the beginning to the completion, so how many days did team a do it first? How many days did Team B do it again?
• 15. Xiao Ming made a local call for six minutes, and then made a long-distance call. The total cost was 2.10 yuan. What's the talk time of the long-distance call 20 yuan for the first three minutes of a local call, and 0. 10 yuan for each subsequent call. 0
• 16. Xiaogang starts from home every morning. It takes 9 minutes to eat breakfast in the morning market 200 away. Then it takes 18 minutes to walk 400 meters to school. After school in the afternoon, Xiaogang takes 23 minutes to walk 500 meters home. How many kilometers does Xiaogang walk from school to home? What's the average speed?
• 17. In Xiaogang's Bank, there are 20 2-cent and 5-cent coins, totaling 7.6 yuan. How many 2-cent coins are there?
• 18. Xiao Gang has several pieces of RMB 5 yuan and RMB 2 yuan. She wants to take out 43 yuan. How many different ways are there? (list all the ways)
• 19. Xiao Ming and his father go to the park to play. Xiao Ming wants to make a plane. Today is children's day. Xiao Ming has half a ticket. His father paid 20 yuan in total and recovered 2 yuan. How much is the ticket price for Xiao Ming and his father
• 20. Xiao Ming's wall clock is slow every hour. At 8 a.m., Xiao Ming sets the clock at the standard time. At 12 noon, what's the standard time?