Solution equation: 2x + 4 = - 3x + 15

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• 1. The conversion of degree, minute and second: 22 ° 18 '= () 36.4' = () () () '"
• 2. Given the quadratic function f (x) = ax & # 178; + BX + C, if a > b > C and f (1) = 0, it is proved that the image of F (x) and X axis have two different intersections
• 3. 75 times 31 / 5 plus 2.8 divided by 4 / 11 plus 11 / 4 equals
• 4. If x is known to be an acute angle, SiNx = 3-m / M + 1, cosx = 2m-1 / M + 1, then M =? Tana =? In a hurry
• 5. The expression of time (English) 1:40 1:50 1:55 o (∩)_ Good drops have points and adopt~
• 6. It is known that circle C1: x square plus y square plus 3 is equal to 0. If circle C2 and circle C1 are circumscribed and tangent to the line L: X equal to 1, the trajectory equation of the center of circle C2 is obtained If the tangents of circle C1 are equal on the x-axis and y-axis, the tangent equation is obtained
• 7. The formula 35 divided by 8 is equal to 4. 3 can solve many problems in life. Please write a mathematical problem solved by this formula
• 8. Given that the equation x2 + IX + 6 = 5x + 2I has real roots, try to find two roots of this equation
• 9. What is a number that is three-thirds larger, two-thirds less, divided by two, plus one-quarter equal to seven twelfth
• 10. The radii of circle O1 and circle 02 are 3cm and 4cm respectively. Under the following conditions, the position relationship between circle O1 and circle O2 can be obtained (1) O1O2 = 8 cm (2) O1O2 = 7 cm (3) O1O2 = 5cm (4) O1O2 = 1cm (5) O1O2 = 0.5cm (6) 01 and O2 coincide
• 11. Xiao Ming asked his father how old he was, and he said, "divide my age by 6, add 14, multiply by 3, and finally subtract 27. It's 33 years old."
• 12. Δ ABC is an equilateral triangle, point E is the point on the extension line of BC, the vertical bisector of be is called AC at point D, and the perpendicular foot is m, CE = CD
• 13. When Xiaochun calculates a division, he takes 72 as 27, the result quotient is 14, and the remainder is 18. What is the correct number?
• 14. AB and CD are two parallel chords of circle O, which are located at the same side of the center O. if AB = 6 and CD = 8, the distance between AB and CD is 1, the radius of circle O is calculated
• 15. How much is 2010 66... 6 times 2010 99... 9
• 16. 1, the solution of the equation 2 / 1 {x-3 / 1 [x-4 / 1 (x-3 / 2) - 3 / 2} = x + 4 / 3 is (). 2, the equation of X: 2A + 5x = 7x-2b (a, B are known numbers), () Urgent! If you are satisfied with the answer, I will give you satisfaction points!
• 17. 1 5 19 81 411 () rule What are the rules in brackets
• 18. How to solve the equation X-1 / 4x - (1 / 4x-4) = 50
• 19. 27 ° 15 ′ 36 ″ = () degree
• 20. The perimeter formula of trapezoid is