1: 20 fill in the blanks 2：

RELATED INFORMATIONS

• 1. It's urgent for you to come to the meeting In the triangle ABC, D is a point on the side of BC, if AB = 10, BD = 6, ad = 8, AC = 17 Judge whether the triangle ABC is a right triangle Finding the area of triangle ABC In the triangle ABC, the angle ACB = 90 degrees, BC = 3, AC = 4, CD is perpendicular to AB, and the perpendicular foot is d If the lengths a, B and C of triangle ABC satisfy a + B + C + 200 = 12a + 16b + 20c, try to judge the shape of triangle ABC
• 2. There are four congruent right triangles, whose right sides are a and B respectively, and the hypotenuse is C. they can be used to form a graph that can verify the Pythagorean theorem. Please draw a graph and use it to verify the Pythagorean theorem
• 3. 1. Given x + y = - 4, xy = - 12, then (x + 1 of Y + 1) + (y + 1 of X + 1) = (write the answer only) 2. The fraction (X-Y of XY) + (X-Y of XY + x) can be reduced to () A. X of Y B. X / XY C. Square x D.x-2y (write the answer only) 3. It is known that [(x-1) (X-2)] (3x-4) = (a of x-1) + (B of X + 1)), and the integers a and B are obtained 4. The ratio of the number of delivery personnel to the number of sales personnel in the home appliance Department of a large shopping mall is 1:8. Due to the obvious increase of home appliance sales this summer, the manager of the home appliance department dispatched 22 people from the sales personnel to deliver the goods. As a result, the ratio of the number of delivery personnel to the number of sales personnel is 2:5?
• 4. 1. A certain automobile transportation company transports a batch of goods. If each vehicle transports 3 tons more, 50 vehicles can transport it completely. If each vehicle transports 1 ton less, 60 vehicles can transport it completely. Under normal circumstances, how many tons of goods can each vehicle transport? 2. Two trains are running in the same direction on parallel tracks, and the front of car a is at the rear of car B. car a travels 1100 meters per minute and car B 800 meters per minute. The body of car a is 120 meters shorter than that of car B. It takes two minutes for car a to catch up with car B and completely surpass car B? 3. In order to beautify the class environment, the class life committee member went to sell the flowers of Grade A, B and C for 39 yuan. The flowers of Grade A, B and C were 4 yuan, 5 yuan and 6 yuan respectively. The life members bought 8 pots of flowers and just ran out of money. How many pots did they sell? 4. If we add natural numbers a and B to the numerator and denominator of the fraction 28 / 43, the result is 7 / 12, then what is a + B equal to?
• 5. a-12=0 (a+b-3)^2=0 a= b= At ten o'clock, the angle between the hour hand and the minute hand is () ° If a + b > 0 AB is known, the symbols of a and B are A is 15 years older than B. five years ago, a was twice as old as B. B is now 15 years old If each inner angle of a convex polygon is 140 degrees, then there are several diagonals starting from a vertex of the polygon
• 6. 1. Party A and Party B set out from two places AB and walked towards each other. When they met, Party A walked 12.5 kilometers more than Party B. It is known that one third of the distance traveled by Party A is equal to three fourths of the distance traveled by Party B. how many kilometers are there between two places AB? 2. A project is completed in 20 days by Party A alone, and has been completed in 30 days by Party A alone. Now party a cooperates with Party A. on the way, Party A has rested for 3 days, and has rested for several days. From the beginning to the completion, it has been 16 days, and how many days have He rested? 3. There are two warehouses A and B, and the grain stored in warehouse a accounts for 40% of the total grain stored in the two warehouses. If 60 tons of stored grain have been transported to warehouse A, the ratio of stored grain in warehouse A and B is 2:1. How many tons of grain have been stored in warehouse A and B? Write every step,
• 7. Just tonight -How to express scientific notation in 0.000112 How to express scientific notation with 0.000000054 2006.7 X 10-5 The little-5 is in the upper right corner of 10 How to convert to original number
• 8. There are four points a, B, C and D on the rectangular coordinate plane, where a (2,0), B (3,4) and C (6,5). If the quadrilateral a, B, C and D constitute a parallelogram, calculate the coordinate of point D
• 9. 1、1/2x²-2xy+2y² 2、8（a²+1）-16a 3、4b²c²-（c²+b²）² Decompose the above factor.
• 10. 1.x²-4 2-x x （ ——— + ———） ÷ ——— x²-4x+4 x+2 x-2 2.3b² 3 (-) & sup2; multiply (- - A - & sup2; b) & sup3; 4a³ 2 b a b a 3. If 3a-2b = 0, then (1 + -) / (1 - -) a a-b a a+b
• 11. Here's a math problem. I hope you can solve it It is known that a is a real number. For the binary linear equations of X, y, 2x-3y = 5A and X + 2Y = 1-2a, the solution of this system is impossible 1. X, y are all positive numbers 2. X, y are all negative numbers 3. X are positive numbers, y are negative numbers 4. X are negative numbers, y are positive numbers
• 12. The number of integers n satisfying the inequality 3|n-1| - 2n > 2|3n + 1|is______ ．
• 13. Arrange three numbers in turn: 3,9,8. For any two adjacent numbers, subtract the number on the left from the number on the right. The difference is written between the two numbers. A new number string can be generated: 3,6,9, - 1,8. This is called low order operation. Continue to operate in turn. Q: sum of all numbers after the 2009 operation Write down the process. Thank you!
• 14. Xiao Hua and Xiao Ming work out an integral multiplication problem (2x + a) (3x + b) at the same time. Xiao Hua copies "a" in the first polynomial into - A, and the result is 6x2 + 11x-10; Xiao Ming copies "3x" in the second polynomial into x, and the result is 2x2-9x + 10. (1) do you know the values of a and B in the formula? (2) Please work out the correct result of this problem
• 15. In the triangle ABC, DM and en divide AC and BC vertically and equally, intersecting AB with m, N. if ∠ MCN = 48 °, then ∠ ACB =?
• 16. Three lines in the plane divide the plane into the least number of parts______ Blocks, at most______ Block
• 17. As shown in the figure, fold △ ABC along De, if ∠ 1 + ∠ 2 = 80 °, then ∠ B=______ Degree
• 18. Two math problems in volume two of grade one! Help me if you can do them! For a container full of liquid medicine, pour out 10L and fill it with water. Then pour out 10L and fill it with water. At this time, the ratio of pure medicine and water in the container is 16:9? According to market research, the relationship between the selling price of the goods and the sales volume is: if the selling price of each product is a yuan, then (320-10a) pieces can be sold, but the price department limits that the price increase of each product can not exceed 25% of the purchase price, How much should be the selling price of each product? How many products should be sold? Thank you, today, I'm in a hurry ~ ~! Help, thank you!
• 19. Some math problems in Volume 2 of junior high school (fill in the blanks) 1. If 2x-y = - 3, then the x power of 4 and the Y power of 2 = () 2. If m power of x = 2 and N power of x = 3, then 2m + n power of x = () 3. Given that the square of the algebraic formula 4x - (k-1) XY + 9y is a complete square, then k = () 4. If 2m power of x = 3, then 6m power of x = () thank you.
• 20. The math problems in volume two of junior high school are due this afternoon Sorry, I don't have points, so I can't give points. But I hope you can help me solve it 1. If an inner angle of a polygon with equal angles is n times of its outer angle, then the number of sides of the polygon is () A. It doesn't exist B、2N+2 C、2N-1 D. None of the above is true 2. In △ ABC, BP bisects ∠ B and CP bisects ∠ C. If ∠ a = 60 degrees, ∠ BPC = () 3. If the sum of interior angles of a polygon is 1260 degrees, then there are () diagonals passing through a vertex of the polygon 4. (n-k) M = ()