In the parallelogram ABCD, ∠ Abe = ∠ CDF, it is proved that the quadrilateral BEDF is a parallelogram

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• 1. Shanghai high school mathematics other inequality solution problem set in turn recorded as a and B, the value range of the real number The solution sets of inequality │ X - (a + 1) & sup2 / 2 │≤ (A-1) & sup2 / 2 and X & sup2; - 3 (a + 1) x + 2 (3a + 1) ≤ 0 are denoted as a and B in turn, so that a is included in the value range of real number a of B
• 2. Let P1 [2,3] P2 [- 1,4] and the extension line of P on p1p2 be the | vector p1p | = 2 | vector PP2 |
• 3. If x and y are opposite to each other, then x + 2y-4 = 0=______ ，y=______ ．
• 4. In s-abc, the size of SA and BC is equal to____ ,
• 5. Given (quadratic power of a + quadratic power of B) * (quadratic power of a + quadratic power of B-8) + 16 = 0, find the value of (quadratic power of a + quadratic power of B)
• 6. Given the set a = {X & sup2;, x, XY}, B = {1, x, y}, and a = B, find the values of real numbers x and y
• 7. Given a + B = 4, A-B = - 3, find the value of negative half a & # 178; + Half B & # 178
• 8. Given that the two sides of a triangle are 5cm and 7cm respectively, find the value range of the third side?
• 9. Solution equation: 3.9x + x = 9.8 34-5x+48=10.6
• 10. Three sides of a known triangular pyramid p-abc PA.PB.PC If the area of the three sides is s1.s2.s3 ', then the volume of the triangular pyramid?
• 11. As shown in the figure, P is in ∠ AOB, and points m and N are the symmetrical points of point P about OA and ob respectively. If Mn = 10cm, calculate the perimeter of triangle PEF
• 12. It is known that, as shown in the figure, CD is the tangent of ⊙ o, C is the tangent point, and the extension line of diameter AB intersects CD at D, connecting OC and BC. (1) write three different types of conclusions; (2) if BD = ob, prove: CA = CD
• 13. The bottom of a triangle warning sign is 1.8 meters and the height is 1.5 meters. What's the area of this warning sign?
• 14. Only two of the prime numbers are even, and the rest are odd nothing
• 15. A triangle is 150 meters long at the bottom, and the ratio of the bottom to the height is 6:5. How many square meters is the area of the triangle?
• 16. The volume of a cylinder is 157 cubic centimeter. The area of the base of a cone is 6.28 square centimeter, and the height of a cone is () centimeter
• 17. Note that the domain of function y = √ 1-lg (x-1) is set a, and the domain of function y = √ 3 * 3-x-3 is set B. find a ∩ B
• 18. (a+b)(a2-ab+b2)-(a+b)2 (a + b) (a ^ 2-AB + B62) - (a + b) ^ 2 to simplify this formula, the answer is - 3A ^ 2b-3ab ^ 2, but how do you get it,
• 19. It is known that ABC, ad and be are the heights of BC and AC sides respectively, the extension lines of EB and ad intersect at h, and AC = BH. Please prove that ad = BD
• 20. The ratio of 5:12 to 20