The radius of circle a is 10 cm, which is twice the diameter of circle B. how many times is the circumference of circle a?

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• 1. Calculation and simplification Square of 1 (- 1 / 2) + 3 / 4 - (2-radical 3) + |2-radical 3| 2 | radical 6-radical 2 | + | radical 2-1 | - | 3-radical 6| 3. Given | a | = 2-radical 2, | B | = 3-2 times radical 2, and a + B = radical 2-1, find the values of a and B
• 2. What are the functions of dashes
• 3. Use four identical squares to form a rectangle with an area of 100 square centimeters. How many centimeters is the circumference of the rectangle!
• 4. A and B solve the equations ax + 5Y = 15 ①, 4x + by = - 2 ② together. Because a misread the letter A, we get the equations ① x = - 3, y = - 1. B misread the letter B, The solution to the equations is x = 5, y = 4. Try to calculate the value of a to the power of 2010 + (- 0.1b) to the power of 2009
• 5. Simple calculation of 7 / 12 + (5 / 6-3 / 8) times 2 / 11
• 6. 3.2 hours equals hours and minutes
• 7. The root of the equation and the zero point of the function! 1. Find the zero point of the function ①y=-x^2+x+6 ②y=(x^2-2)(x^2-3x+2) 2. The interval of the root of square root lgx + x = 0 is () A.(-∞,0) B.(0,1) C.(1,2) D.(2,4) 3. It is known that the image of the function y = f (x) is continuous, if there is a corresponding value table as follows X 1 2 3 4 5 6 y 123.56 21.45 -7.82 11.45 -53.76 -128.88 Then the function y = f (x) has at least () A. 2 B.3 C.4 D 5 A function with zeros in the interval [3,5] is () A.f(x)=2xln(x-2)-3; B.f(x)=-x^3-3x+5 C.f(x)=2^x-4 D.f(x)=-1/x+2 4. If the two zeros of the function f (x) = x ^ 2 - (T-2) x + 5-T are greater than 2, then the value range of T is_____ 5. The quadratic equation x ^ 2 + (m-1) x + 1 = 0 has unique solution in the interval [0,2], Then the value range of the real number M_________ 6. Let f (x) = ax + 2A + 1 (a ≠ 0)
• 8. 6 / 7 x 3 / 1 + x = 11 / 14, 1 / 3 x = 24,
• 9. How to solve this equation: 8:0.01 = 2 / 3: x The final answer is 1 / 1200, how to write the process
• 10. If the positive integer solution of inequality 3x-a ≤ 0 is 1, 2, 3, then the value range of a is 1______ ．
• 11. If the diagonals of the parallelogram ABCD intersect at point O, △ AOB is an equilateral triangle and ab = 3, then the area of the parallelogram ABCD is () and the perimeter is（ Tell me why
• 12. 21 and 35 common factors
• 13. With the common factor, the common multiple solution application problem everybody helps, thanks! 1, a number divided by 56 more than 48, if divided by 72 more than 64, this number is at least? 2. There is a pile of apples, which are divided into 7kg, 8kg, 9kg and 10kg, with 3kg left? 3. No.1, No.2 and No.3 buses in a city leave at different times. No.1 bus leaves every 3 minutes, No.2 bus leaves every 5 minutes, No.3 bus leaves every 8 minutes. At 3:00 p.m., No.3 bus leaves from the terminus. What's the time for the next No.3 bus to leave from the terminus at the same time? 4. There is a rectangular timber with a length of 140 decimeters, a width of 56 decimeters and a height of 28 decimeters. How many kinds of saw hairs are there when it is sawed into a square with equal volume? If the square required to be sawed is the largest, how many sections can it be sawed into? 5. A batch of bricks, 45 cm long and 30 cm wide, at least how many such bricks can be used to make a square?
• 14. The least common multiple of 12,20,30,42,56,72
• 15. What is the common multiple of 6.12.20.30.42.56.72
• 16. The least common factor and the greatest common multiple of 40, 56 and 84
• 17. Common multiple of 20 30 42 56 72 90 Come on, Kuai
• 18. Decompose 64.72.115.98.56.39.45.88.91. Into prime factors
• 19. (1) Find the greatest common factors 8 and 56 88 and 11 5 and 17 for each group of numbers below Find the least common multiple of 12 and 48 7 and 8 6, 24 and 36 Fill in the appropriate number in () as required It's a multiple of two and a multiple of three 26(　） 7（　）24 4（　）3（　） It's also a multiple of 2.5.3 63（　） 5（　）0　 6（　）7（）
• 20. The greatest common factor of 91 56