Integral calculation in grade one of junior high school M + n power of X (n power of 3x, n power of Y) divided by (- n power of 2x, n power of Y)

1. (- 2A) (1 / 4A & # - 1) 2, (- 1-2a) (2a-1) - 13, 298 square - 297 times 2994, known (a-b) square = 4, ab = 1 / 2, then (a + b) square = 5, known (M + 2n + 2) (M + 2n-2) = 12, then (M + 2n) square = (Chapter 1 operation of integers) unit test volume 2012 (2): (1

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10. My son has just been on the first day of junior high school. The mixed operation of rational numbers is in a mess. What should I do?
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12. Xiaogang's family spent 500 yuan on meals, 200 yuan on education and 500 yuan on other expenses last month. This month, the three expenses of Xiaogang's family increased by 10%, 30% and 5% respectively. What's the percentage increase of Xiaogang's total expenses this month compared with last month?
13. Average application 2 1. After reading a book for 37 days, Xiao Jun still had 1 / 3 of the original book. After that, he read 12 pages a day and another 5 days, just finished. How many pages does he read every day? 2. Someone goes up the mountain at the speed of 3 kilometers per hour, and goes back along the original road at the speed of 6 kilometers per hour when he goes down the mountain? 3. A tractor plows two identical plots of land. The first plot plows 20 mu per day on average, and the second plot plows 16 mu per day on average. After all the two plots are plowed, how many mu per day does the Tractor Plow? 4. There are four numbers. From the second number, each number is three more than the previous one. The average of these four numbers is 24.5. What is the largest of these four numbers? five
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