The set of parallelograms Using characteristic property description method

The set of all quadrilaterals with two equal contrasts

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1. The three forces are 68.12n, and the resultant force range is calculated
2. How to find the range of resultant force of three forces
3. The resultant range of three forces If the third force is not in the range of the first two forces, what is the minimum value of the resultant force If the third force is not in the range of the first two forces, it cannot be zero
4. 1 / 2 times (2 / 8 + 1 / 24 + 2 / 48... + 2 / 360)
5. 3x^2-[5x-(2/1x-3)+2x^2]=
6. Simple calculation of 49 + 49 × 49
7. If the system of inequalities: 1 < x ≤ 2 x > m has a solution, then the range of M is a.m
8. How many meters is two feet nine
9. Fill in the numbers according to the rules. What is the hundredth number of 1, 1 / 2, 1 / 4, 1 / 8, 1 / 16?
10. Human blood accounts for 1 / 13 of body weight, 2 / 3 of blood is water, XXX weight is 39kg, how many kg does his blood contain water? Please write the formula in detail!
11. How to express the set of parallelogram?
12. What properties of parallelogram can be used to describe the set of all parallelogram?
13. Representation of a set of parallelograms by description
14. To describe the set of parallelogram by enumeration
15. Several drawing methods of parallelogram
16. The method of proving parallelogram
17. How to prove parallelogram
18. There are several ways to cut a parallelogram into a rectangle
19. There are several ways to divide a parallelogram into three parts
20. What is the relationship between the two equations (the square of x) + PX + q = 0, Q * (the square of x) + p * x + 1 = 0