Given 4x-5y = 0, then X-Y / X=

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• 1. X & # 178; + Y & # 178; = 9, x + y = 4, find the value of XY
• 2. When x = 2, y = 9, what is XY & # 178; + 6?
• 3. As shown in the figure, the rectangle ABCD with a circumference of 68cm is divided into seven identical small rectangles, and the area of the rectangle ABCD is______ ．
• 4. When will the hour hand and the minute hand coincide between 8:00 and 9:00? When will the hour hand and the minute hand be in a straight line between 8:00 and 9:00? When will the hour hand and the minute hand coincide between 4:00 and 5:00? When will the hour hand and the minute hand be in a straight line between 4:00 and 5:00? It can be expressed as a fraction.)
• 5. Four mathematics problems in Grade 1 of junior high school, to process, please do me a favor, give points according to the answers 1. Given the quadratic power of X + the quadratic power of Y - 2x-6y + 10 = 0, find the value of X and y 2. Factorization: 9m quadratic - 4N quadratic + 4N-1 (y + 1) (2 power of Y + 1) - (2 power of Y + 1) 4. The second power of a + the second power of B - 6A + 4B + 13 = 0, and the value of a in B If all the questions are correct, you can get high marks
• 6. (- 1) ^ 2009 × (- 1 / 2) ^ - 2 + (root 3 - π) ^ 0 + / 1-sin60 ° / + / - 2 / + 2sin30 ° - (- root 3) ^ 2 + (tan45 °) ^ - 1 Prompt: / / represents absolute value
• 7. Known 123456789101112 997998999 is a number arranged by consecutive integers 1 to 999. In the number, the number on the 2013 bit from left to right is______ ．
• 8. Who can help with this math problem Choose 6 of the 10 numbers from 0 to 9 and add them up to 23 (reselection is allowed) to find the 6 numbers (write as many as you have)
• 9. Several mathematics problems, seek the big God solution! 1、 Fill in the loop section at the right place, and the following formula holds 2.345＞2.345＞2.345＞2.345 0.613＜ 0.613＜ 0.613＜ 0.613 2、 If the quotient is 2.6, the remainder is (); if the quotient is 5600 △ 500, if the quotient is 11, the remainder is () What rules do you find? 1÷9=0.1... 2÷9=0.2... 3÷9=0.3... 4÷9=0.4... 5÷9=0.6... 6÷9=0.6... A: I found out_________________________________________________________ .
• 10. If the positions of the single digit and the ten digit of a two digit number are exchanged, the new two digit number will be 9 larger than the original two digit number. How many two digit numbers are there? What are their characteristics?
• 11. Given x ^ 2 + 4x + y ^ 2-2y + 5 = 0, find the value of 4x + 5Y To calculate (process) and train of thought with complete square formula
• 12. Given 4x-5y = 0, then the value of (x + y): (X-Y) is () A. 1：9B. -9C. 9D. -1：9
• 13. If X:: y = 3:4, then the value of 4x-5y / 4x + 5Y is?
• 14. Find 4x + 2 = - x + 3, 20-y = - 1.5y + - 2
• 15. If 4x-5y = 0, then the value of (X-Y) / X is
• 16. The quadratic power of 4x, the quadratic power of y-5y = the quadratic power of X, y
• 17. A math problem about similarity The shadow of a big tree falls on the wall and the ground respectively. At the same time, the shadow length of a 1m high benchmark is 0.5m. At this time, the shadow length of a big tree falling on the ground is 3M and that on the wall is 2m. The height of a big tree can be calculated
• 18. Statistics of a math problem in the first day of junior high school as follows Month 1 2 3 4 5 6 7 8 9 10 11 12 Sales 100 80 40 10 10 04 8 25 90 120 1. Please make a statistical table of quarterly distribution and calculate the percentage of quarterly sales in the whole year 2. What can you see from the two statistical charts? What suggestions do you have for the factory?
• 19. Question 1: the speed of the earth's revolution around the sun is about 1.1 × 10 km / h, and the speed of sound propagation in the air is about 330 M / s. compare the two speeds Question 2: a day has 8.64 × 10 fourth power seconds, a year is calculated according to 365 days, how many seconds a year has, expressed by scientific counting method
• 20. 165°16′30〃-7°30′/6+4°12′50〃*3