Nine mathematical problems about square difference and complete square~ This paper is going to be 179;; - 6x & \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\35;178; + 1.8. (x + y) ² + 18 (x + y) + 81.9. (X & #178; + 2x & #178;) + 2 (X & #178; + 2x) + 1, choose a few!

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• 1. Solve mathematical problems, complete square. Square difference （x+5）²-（5x+1）² 4（x-6）²-（3+x）² 9（2x-3）²-（3x）²
• 2. Mathematics problem of grade one in junior high school Calculation: - 1 / 10 × 11-1 / 11 × 12-1 / 12 × 13... - 1 / 19 × 20 =?
• 3. Xiaohong often goes out for a walk at 6 in the evening. She sees that the angle between the hour hand and the minute hand of her watch is 110 degrees. She walks home before 7 o'clock and finds that the angle between the hour hand and the minute hand of her watch is still 110 degrees. How long did Xiaohong take a walk?
• 4. 165°16′30〃-7°30′/6+4°12′50〃*3
• 5. 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
• 6. 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?
• 7. 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
• 8. The quadratic power of 4x, the quadratic power of y-5y = the quadratic power of X, y
• 9. If 4x-5y = 0, then the value of (X-Y) / X is
• 10. Find 4x + 2 = - x + 3, 20-y = - 1.5y + - 2
• 11. That is, (n / M + 5) * (n / m-5) = - 1, how to get n & # 178; = 25-m & # 178;
• 12. When m = 0.75, n = 0.25, find the value of m-n-178; - m-n-178; + m-n-178; + n
• 13. (-2ab²)²*(3a²b-2ab-1)= Calculation questions
• 14. -8A ^ 2B (a-b) + 4AB (B-A) ^ 2-2a (B-A) decomposition
• 15. 2004^-2005*2003 2004^2-2005*2003
• 16. 2004*2004—2003*2005
• 17. 1+1/1.2+1/2.3.1/2003.2004+1/2005
• 18. Simple calculation of 2005 × 2005 / 2006
• 19. If 10 ^ a = (1 / 3) ^ - 2, 10 ^ B = 4 ^ - 1, try to find the value of 9 ^ A / 3 ^ 2B 2006 ^ 2-2006 * 4010 + 2005 ^ 2
• 20. (- 1) + (+ 2) + (- 3) + (+ 4) and so on to + (- 2005) + (- 2006) + (- 2007) + (+ 2008) need simple calculation