Calculate the following questions with decimals 12m 9cm + 3M 48CM 6km - 4km 8m 2 yuan 54 Fen + 9Yuan 08 Fen

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• 1. A circle passes through a (- 2,1), B (5,0) and the center of the circle is on the straight line x-3y-10 = 0 A circle passes through a (- 2,1), B (5,0) and the center of the circle is on the straight line x-3y-10 = 0
• 2. What simple arithmetic does decimal multiplication have
• 3. Cut the area of a circle into two sectors according to 2:7. The area of the large sector is 15 square centimeters more than that of the small sector. What is the area of the small sector?
• 4. A simple harmonic motion with a period of 4S and an amplitude of 2cm is made. From t / 8 to t, the distance of the particle motion is smaller than 7cm. Why How about the journey of one eighth cycle? What do you mean by 6 + (2-2sin45)?
• 5. Put two squares with 5cm sides together to form a rectangle. What's the perimeter and area of the rectangle?
• 6. What is the relationship between radius, linear velocity, angular velocity and period of a circle? And explain who decreases / increases with who increases
• 7. A sector with radius of 15 and center angle of 216 ° is rolled into the side of a cone, and the height and volume of the cone are calculated
• 8. How to get rid of brackets in mathematical algebraic expressions? How to change symbols? For example: - (A5 [power] - 6B) - (7 + 3b)
• 9. Find the circumference of a circle with radius or diameter. Find the area of a circle with radius or diameter
• 10. The function f (x) = x3-x is known to decrease on (0, a) and increase on [a, + ∞). The value of a is obtained. The expert is requested to answer
• 11. Let p be the point on the ellipse x ^ 2 / 100 + y ^ 2 / 64 = 1, let F1 and F2 be the two focal points of the ellipse, and if the angle f1pf2 = 60 °, calculate the area of △ pf1f2
• 12. 1. Car a and car B come from both places at the same time. Car a travels 70 kilometers per hour, while car B travels 85 kilometers per hour. When they meet, car B exceeds the midpoint by 60 kilometers. How far is the distance between the two places? 2. The school organizes a spring outing. The first car travels 30 kilometers per hour and starts at 7 am. The second car starts at 1 pm. The speed is 40 kilometers per hour. As a result, the two cars arrive at the same time. How far is it from the school to the scenic spot?
• 13. Indefinite integral DT 1. Why is it equal to - 1 / Sint + C =The second power of 1 / sint =The third power of 1 / 3 * Sint + C
• 14. Some calculation problems of fractions 2 / 9 minus 7 / 6 times 2 / 9 2. Four fifths by seven ninths by five eighties 3. 5 / 7 by 16 / 5 by 21 / 5 Of course, it's multiplication before subtraction
• 15. In the set with the solution of equation x & # 178; - 4x + 4 = 0 and equation x & # 178; - X-2 = 0 as elements___ There are two elements
• 16. If a is rational, then - a must be negative? Why?
• 17. Let's know that one root of the quadratic equation AX2 + BX + C = 0 is 1, Let a root of the quadratic equation AX & # 178; + BX + C = 0 be 1, and a, B satisfy the √ A-2 + √ 2-a-equality B = √ A-2 + √ 2-a-3, find the root of the square of the equation y-c = 0
• 18. Ha 1. On the clock face, a fixed end of the long needle is taken as the rotation center. When the long needle rotates 240 ° from 12 o'clock, the position of the long needle represents the time of? Minutes 2. If point a and point B are symmetrical about line Mn, and the distance between point a and Mn is 1.8 cm, then the length of line AB is? Cm 3. The triangle ABC moves 2cm along the line where the BC side is located to get the triangle a1b1c1. If the side length of BC is 6cm, then the length of segment BC1 is? Cm 4. The following four kinds of narration are wrong () (1) The direction of translation is the same, and the end position of translation is the same (2) If the distance of translation is the same, the end position of translation is the same (3) If the line m is perpendicular to the line AB, then points a and B are symmetric about the line (4) If the line m bisects the line segment AB, then points a and B are symmetric with respect to the line A. 1 B.2 C.3 D.4 5. Among the following four statements, the correct one is () (1) A rectangle is a centrosymmetric figure, and the center of symmetry is the focus of two diagonals (2) If the lines of the corresponding points of two graphs pass through a certain point and are bisected by this point, then the two graphs are centrosymmetric about this point (3) The midpoint of the line segment connecting two points on a centrosymmetric graph is the center of symmetry (4) Circles are centrosymmetric figures, so two circles are centrosymmetric figures A. 1 B.2 C.3 D.4
• 19. The limit of Ln (1 + 1 / x) divided by π / 2-arctanx when x tends to infinity When x tends to 1, what is the limit of X & # 179; - 3x & # 178; + 1 divided by X & # 179; - X & # 178; - x + 1
• 20. Is the limit of SiNx (x tends to infinity) positive or negative 1? Such as the title