The first one: M + 3 / M - the square of M - 9 / 6 / M - 2 / 3, where M = - 2 (simplified evaluation) The second: X-2 / 5x-4 = 3x-6 / 4x + 10 Final - 1 (solving the equation) Who can tell,

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• 1. Fill in the operation symbols to add, subtract, multiply and divide to make the equation true 5 5 1 5=8 3 8 3=24 It's a continuous equation
• 2. The teacher takes two students to visit the museum 33 kilometers away from the school. The teacher takes a motorcycle with a speed of 25 km / h. the back seat of the motorcycle can take one student with a speed of 20 km / h. The walking speed of the students is 5 km / h. please design a scheme so that the time for the three teachers and students to arrive at the museum is no more than 3 hours
• 3. Xiao Ming goes to school by bike from home every minute. After 8 minutes, it is 60 meters away from school. How many meters is Xiao Ming's home away from school
• 4. Xiao Ming walks to school from home in the morning. Half the way, his father finds Xiao Ming's math book at home, Then he rides a bike to deliver books to Xiao Ming. When he catches up, Xiao Ming still has 3 / 10 of the way to go. Xiao Ming immediately gets on his father's car and is sent to school by his father. In this way, Xiao Ming arrives at school 5 minutes earlier than walking alone. How long does it take Xiao Ming to walk from home to school?
• 5. Xiaoming walks to school from home in the morning. Half the way, his father finds that his math book is left at home. He rides a bike to deliver the book to Xiaoming. When he catches up, Xiaoming still has 310 miles to go. Xiaoming immediately gets on his father's car and is sent to school by his father. In this way, Xiaoming gets to school 5 minutes earlier than walking alone. How long does it take Xiaoming to walk from home to school?
• 6. Xiaoming walks to school from home in the morning. Half the way, his father finds that his math book is left at home. He rides a bike to deliver the book to Xiaoming. When he catches up, Xiaoming still has 310 miles to go. Xiaoming immediately gets on his father's car and is sent to school by his father. In this way, Xiaoming gets to school 5 minutes earlier than walking alone. How long does it take Xiaoming to walk from home to school?
• 7. Xiaoming's journey from home to school is 540 meters. It takes him 9 minutes to go to school, and it takes him 3 minutes less to go home than to go to school? It's wrong. 540 △ 9 = 60m, 540 △ 6 = 90m (90 + 60) △ 2 = 75m. This answer is wrong. The great Xia can help me see where it is wrong. The correct answer is 540 × 2 △ 9 + 6 = 72m
• 8. It took Xiaoming 15 minutes to get to the school 1.08 kilometers away from home. What's the speed on Xiaoming's way to school?
• 9. Xiaoming's distance from home to school is 1000 meters. It takes 15 minutes for Xiaoming to go to school and 25 minutes for Xiaoming to go home from school. What's the average speed for Xiaoming to and from school How many?
• 10. It takes Xiaoming 50 minutes to walk from home to school and 15 minutes by bike. One day, Xiaoming set out on foot from home and went to school 20 minutes away from home The grandmother's house on the same route went to pick up the bike and continued to drive to the school. If he didn't remember the time of picking up the bike, how many minutes did Xiao Ming spend from home to school on this day?
• 11. Given 3x + 4y-6 = 0, find 8 ^ x * 16 ^ y
• 12. 1. 101 * 99-100 and 1 / 2 * 99 and 1 / 2
• 13. Fast, fast, 1. If (a-b) × 0.5 = 1.2, a △ 0.2 = 12, then B = () 2. To make the equation "number + Learning" × (number + Learning) = mathematics "hold, then the number represented by" number "is (), and the number represented by" learning "is () 3. One and a quarter × 17.6 + 36 △ four fifths + 2.64 × 12.5= four
• 14. The two passenger and freight cars leave from the two places at the same time. After two hours of meeting, the distance ratio between the passenger car and the freight car is 2:5. The passenger car travels 40 kilometers per hour, and the freight car travels how many kilometers per hour Another way is that for a project, Party A and Party B need to complete it in six days. It is known that 1 / 2 time for Party A to complete this work alone is equal to 1 / 3 time for Party B to complete this work. How long does it take for Party A to complete this work alone?
• 15. What is the constant term in the expansion of (x + 1 / x) ^ 4?
• 16. 1、 Calculate the surface area of each cylinder The radius of the cylinder is 3.3 cm and the height is 5.5 cm (2) the bottom is C = 15.7 and the height is 6.6 (3) the radius of the cylinder is 5 cm and the height is 16 cm 2、 The specification of a certain cylindrical potato chip box is shown in the figure on the right, with a radius of 3cm and a height of 10cm. How many side wrappers can be made per square meter at most? 3、 To make a cylindrical iron sheet, the circumference of the bottom surface is 18.84 decimeters, and the height is 8 decimeters. How many square decimeters of iron sheet do you need to make this oil barrel? 4、 A cylindrical chef's hat (with only one bottom) has a bottom radius of 8 cm and a height of 25 cm. How many square centimeters of white cloth do you need to make this cook's hat? 5、 A cylindrical sewage treatment tank with a bottom radius of 20 meters and a depth of 5 meters. Cement should be applied to the side and bottom of the tank. How many square meters is the area of the cement part? Just give me the answer, but the second question needs to be formulated
• 17. 1. Observe the following formulas: 1 + 2 + 1 = 4, 1 + 2 + 3 + 2 + 1 = 9 1＋2＋3＋4＋3＋2＋1＝16 1＋2＋3＋4＋5＋4＋3＋2＋1＝25 (1) Please find out the law of it 2. Using the rule of (1), please quickly calculate: 1＋2＋3＋…… ＋99＋100＋99＋…… The value of + 3 + 2 + 1 2. Observe the following equation: 2＝2＝1x2 2＋4＝6＝2x3 2＋4＋6＝12＝3x4 2＋4＋6＋8＝20＝4x5 (1) Write the sum of continuous even numbers from 2 to n (n is a natural number) (2) When n = 10, what is the sum of consecutive even numbers from 2 to the 10th
• 18. If (0.5 + a) ^ 2 and | B-2 | are opposite, then a ^ B =? In the process of culture, a certain bacterium splits every half an hour (from one to two). If the bacterium splits from one to 16, how many hours will it take?
• 19. Brother and sister, come and help me with this math problem Try to explain that the product of 4 continuous natural numbers and the sum of 1 is a complete square number
• 20. If two angles complement each other, and one of them is 30 degrees less than four times the other, then none of them is () A 42 degrees, 138 degrees or 40 degrees, 130 degrees, B 42 degrees, 138 degrees C 30 degrees, 150 degrees, d above the answer is wrong It is known that the angle AOB is 50 degrees and the angle AOC is 110 degrees. Make bisectors of AOB and AOC, OM and on respectively. The size of the angle mon is—— Why is the solution of the equation 2x-2m = 3x-4x-1? According to the 12th Five Year railway regulations of our province, after the completion of the Lianyungang Xuzhou passenger dedicated line project, the shortest passenger transport time from Lianyungang to Xuzhou will be shortened from the current two hours and eighteen minutes to 36 minutes. The starting speed will be increased by 260km per hour. The equation is used to solve the train speed after the speed increase (Jingxue is accurate to 1km per hour)