On the inequality 2x + m of X

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• 1. In Cartesian coordinates, the symmetric point of point a (5,0) about the origin is C 1. Please write the coordinates of point C directly 2. If point B is in the first quadrant, angle OAB = angle oba, and the symmetric point of point B about origin o is point D Judging the shape of quadrilateral ABCD (to be proved)
• 2. 3. The slope of the line 3x + 4y-12 = 0 is - the intercept on the y-axis is——
• 3. (5.87+1514+2.13+914)×(234−1.75)+(1÷27−3.5)×3.99．
• 4. The result of his calculation is different from the correct answer ()
• 5. If a > 0, B
• 6. The definition and range of y = 3arcsin (x-1)
• 7. In the known △ ABC, a = 45 °, C = 30 ° and C = 10cm, the triangle is solved
• 8. As shown in the figure, make the bisector ad of angle ∠ a of △ ABC, if AC + CD = AB, AC = BC, find the area of triangle ABC Under the condition of (1), extend ad to e, make ∠ DCE = CAD, prove that ad = 2ce
• 9. What is the Chinese meaning of the English abbreviations "UNECO", "PLA", "ABC", "IBM", "IOC", "CAAC", "MBA", "NBA", "DDD", "EMS"? Change "UNESCO" to "UNESCO"
• 10. The sum of the numerator and denominator of a fraction is 21. After the denominator is increased by 19, you can get the simplest fraction 1 / 4, and find the original number. Hurry, I have to hand it in this afternoon. Who will say it quickly
• 11. How to solve the equation 3x + (100-x) △ 3 × 1 = 100
• 12. How to solve the equation with 1 / 14:5 = 3 / 7: x?
• 13. What is the relationship between the zeros of functions and the roots of equations?
• 14. How many hours is three hours and nineteen minutes?
• 15. (+ 7 3 / 4) + (- 5 11 / 11) + (- 3 1 / 4) + (- 6 5 / 11) + (+ 17 1 / 4) + (+ 1 1 1 / 4)
• 16. 1. It is known that the equation A & # 178; X & # 178; + (2a-1) x + 1 = 0 has two real number roots x1, x2. (1) when a is what value, x1 ≠ x2; (2) whether there are real number roots which are opposite to each other? If so, find out the value of a; if not, explain the reason
• 17. The perimeter of a rectangle is 24cm, and the ratio of length to width is 5:1. What is the area of the rectangle?
• 18. How to use dash in English we kown that she tried to learn about every thing she found--I believe she would have much to say about the many countries she lived in. Why change a dash to a semicolon?
• 19. Simplification and calculation Calculate that the square of a minus the square of B plus the square of 2B minus 1 / a minus the square of B plus a plus B, where a plus B equals 2000
• 20. The diameter of circle a is 8 cm, which is 40% of the diameter of circle B______ Cm