What are the functions of dashes

The first function of dashes is to explain the words above. This usage is similar to brackets. The difference between them is that the sentences marked in brackets only explain the words above, not the text, and need not be read out

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1. Use four identical squares to form a rectangle with an area of 100 square centimeters. How many centimeters is the circumference of the rectangle!
2. 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
3. Simple calculation of 7 / 12 + (5 / 6-3 / 8) times 2 / 11
4. 3.2 hours equals hours and minutes
5. 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)
6. 6 / 7 x 3 / 1 + x = 11 / 14, 1 / 3 x = 24,
7. How to solve this equation: 8:0.01 = 2 / 3: x The final answer is 1 / 1200, how to write the process
8. If the positive integer solution of inequality 3x-a ≤ 0 is 1, 2, 3, then the value range of a is 1______ ．
9. Please! In the rectangular coordinate system, the points a (2a, a + B-1), B (- B, A-1) are symmetric about the origin, so find the value of a + B It's a process! Please, please!
10. The slope of the line 3x + 4y-12 = 0 and the intercept of the y-axis are
11. 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
12. 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?
13. 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
14. 21 and 35 common factors
15. 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?
16. The least common multiple of 12,20,30,42,56,72
17. What is the common multiple of 6.12.20.30.42.56.72
18. The least common factor and the greatest common multiple of 40, 56 and 84
19. Common multiple of 20 30 42 56 72 90 Come on, Kuai
20. Decompose 64.72.115.98.56.39.45.88.91. Into prime factors