Make a rectangle with two squares of 1 cm in length. What's the perimeter of the rectangle?

Two squares with a side length of 5cm are put together to form a rectangle. The perimeter of this rectangle is (30cm). Cut out the largest square on a rectangular paper with a length of 15cm and a width of 10cm, and the perimeter of the remaining part is (30cm)

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1. The radius of a sector is 30cm, the center angle is 120 ° and it is used as the side of a cone______ ．
2. The circumference of a circle is 4 π cm, and its area is______ Square centimeter
3. Simplification: asin0 ° + bcos90 ° + ctan180 °; - P (square) cos180 ° + Q (square) sin90 ° - 2pqcos0 ° We also know that Tana = - 3 / 4, find Sina, cosa. We know that cosa = 0.68, find Sina, Tana (retain 2 significant digits). Simplify a (square) Cos2 π - B (square) SIN3 π / 2 + abcos π - absin π / 2
4. Several usages of Dash: select the function of Dash: a) explain b) voice lengthen C) topic change d) further explain Annie is a girl full of vitality, extraordinary patience and rich imagination --- a natural teacher 2. This is a special typeface specially printed for the blind - "reading" through the feeling of hand 3. Thank Annie for giving me the ability to speak this precious gift Note: for the text, please refer to Lesson 18, Volume 11, Xiaoyu, Western normal school edition, always remember you, teacher
5. It is known that the perimeter of a rectangle is 45cm and the length of one side is ACM, then the area of the rectangle is as follows:
6. Given the equation x ^ 2-kx-2 = 0 about X, let the two equations be X1 and X2, and 2 (x1 + x2) > x1x2, find the value range of real number K
7. -4.5 + (- 17 / 3) equals
8. 15-1 out of 8 is equal to?
9. How to establish the connection between the zero point of function and the root of equation?
10. Solve the equation 1 / 7: x = 9 / 14: 3 Solve the equation 1 / 7: x = 9 / 14: 3
11. As shown in the figure, in RT △ ABC, ∠ C = RT ∠, three semicircles are made by taking the three sides of the right triangle as the diameter, then the relationship among S1, S2 and S3 is as follows:______ ．
12. Find the equation that passes through the intersection of the straight line / 1:2x + 3y-5 = 0, / 2:3x-2y-3 = 0, with an inclination angle of 45 degrees!
13. The focus of the ellipse is f1.f2, and there is a point P on the ellipse, so that the angle f1pf2 is equal to 120 degrees, then the value range of eccentricity e of the ellipse is? Answer The focus of the ellipse is f1.f2, and there is a point P on the ellipse, so that the angle f1pf2 is equal to 120 degrees, then the value range of eccentricity e of the ellipse is? The answer is [root 2 / 3.1]
14. Using C + + to calculate the approximate value of definite integral function requirements: 1) the left and right end points of the input interval; 2) using rectangular method and parabolic method to calculate the definite product of user-defined function Using C + + to find the approximate value of F (x) = x * x - 2 * x - 1 by rectangle method and parabola method, and using C + + to find the approximate value of definite integral
15. Given that the two points of equation 2x-5x-7 = 0 are - 1,7 / 2, then the distance between the image of quadratic function y = 2x-5x-7 and the two intersections of X axis is
16. If x = 1 is a solution of the quadratic equation AX2 + bx-40 = 0 and a ≠ B, then the value of A2 − b22a − 2b is______ ．
17. 1 / 1 + 2 + 1 / 1 + 2 + 3 + 1 / 1 + 2 + 3 + 4 + +1/1+2+3+…… +20 = m / N. where m and N are positive integers and have no common divisor. Find m + n
18. >What is the number in front of the multiplication sign in the multiplication formula_ Teaching design of the meaning of multiplication and the law of operation
19. To solve the equations: {2a-b = - 3,2b-a = 3 2a-b=-3 2b-a=3
20. +2! + 3! 3 / 2 +2! + 3! 3 / 3 Plus + 3! + 4! 4 / 4 plus 3! + 4! + 5! 5 / 5 Plus + (n + 1)! + (n + 2)! Sum of 1 / 1