Calculation formula of trapezoid circumference Circumference!
Trapezoid is a quadrilateral with only two parallel sides. In all regular quadrilaterals, it is irregular. Therefore, its circumference can only be the sum of the lengths of the four sides, and there is no calculation formula
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- 1. How much is a multiplied by its reciprocal and a equals one and four fifths
- 2. What is the solution of equation 3 / (x-1) + 4x / (1 + X & sup2;) = - 1 / (x + 1) and how to solve this equation?
- 3. Fill in the blanks: 1 / 6, 1 / 4, 3 / 8, (), (), 81 / 64
- 4. When m takes what value, the solution of the equation 4x + m (X-6) = 2 (2 + 3M) about X is a positive integer Attention! It's 2 + 3M, not 2-3m
- 5. Simple calculation of 2000 × 19991999-1999 × 20002000 Try to finish on the same day! Don't copy!
- 6. If the radius of ⊙ o is 10, the chord AB = 12, the chord CD = 16, and ab ∥ CD, then the distance between the two chords is______ .
- 7. Simple calculation of 222 × 111 + 111 × 444 It is a simple operation of 222 × 778 + 111 × 444
- 8. In equilateral △ ABC, the bisectors of ∠ ABC, ∠ ACB intersect at point O. if the vertical bisectors of OB and OC intersect at points E and F, the quantitative relationship between EF and ab is conjectured and proved
- 9. Bruce Lee mistakenly wrote a number multiplied by 6 as divided by 6. Then he wanted to add 19, but he mistakenly subtracted 19, and finally got to 36, If calculated according to the correct operation, what should it be
- 10. [solving equation] (1) 1 / 2x = 3 / 4 (2) 2 / 3x + x = 15)
- 11. If a divided by B equals 45, then (a multiplied by 3) divided by B equals (), and a divided by (b multiplied by 3) equals (). Thank you,
- 12. The expression of parabola y = ax ^ 2 + BX through D (4,3) a (6,0)
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- 14. Example (1) 8*73+52*8 =8*(73+52) =8*125 =1000 Example (2) 9*96+3+9 =9*(96=3+1) =9*100 =900 For my daughter's homework, I don't know how to calculate, why to calculate like this, and why, exercises 1、 54 * 99 + 99 + 45 II. 54 + 99 * 99 + 45 3、 100 * 89 + 89 * 11 + 89 * 89 IV. 100 * 89-89 * 11-89 * 89 There is also the question 5*999+5+99*7+7+4*9+4=
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- 19. If we keep fixed points F1 (- 2,0) and F2 (2,0), then the locus of the moving point P satisfying the following conditions in the plane is hyperbolic A./PF1/-/PF2/=_ +3 B./PF1/-/PF2/=_ +4 C./PF1/-/PF2/=_ +5 D./PF1/^2-/PF2/^2=_ +4 Note: Pf1 / medium / is absolute value_ +3 is positive and negative
- 20. It is known that 2x + y = 7 is a quadratic equation of X and y, and the solutions of the equations are positive integers