Given x ^ 2-x-1 = 0, find the value of the algebraic formula x ^ 3-x ^ 2-3x + 2008
x^2-x-1=0…………………………… ①x^3-x^2-3x+2008…………………… ②①×x =x^3-x^2-x=0………………… ③ Substituting 3 into 2, we get the solution of - 2x + 2008: 1 - X1 = ((radical 5) + 1) / 2 x2 = (1 - (radical 5)) / 2 into - 2x + 2008, we get 2007 -
RELATED INFORMATIONS
- 1. When x is equal to, x + 1 is equal to x minus 1 RT
- 2. X minus one part of X is equal to t, and the algebraic expression containing T is used to express X I mean, for example, if x minus one equals T, then x equals t plus one
- 3. Given a + B = 5, ab = 3, then the value of the algebraic formula a3b-2a2b2 + AB3 is______ .
- 4. Given a + B = 23, ab = 2, find the value of the algebraic formula A2B + 2a2b2 + AB2
- 5. Given a + B = 5, A-B = 3, find the value of the algebraic formula A & sup3; b-2a & sup2; B & sup2; + AB & sup3
- 6. If x = (Y-1) / (y + 2), then y is expressed as y by the algebraic expression of X=_______
- 7. 1. It is known that a, B and C are not equal to each other Find 2a-b-c / (a-b) (B-C) + 2b-c-a / (B-C) (B-A) + 2c-a-b / (C-A) (C-B) =? (/ is a fractional line) 2. It is known that 1 / A + 1 / B + 1 / C is not equal to 0 The solution equation is: x-a-b / C + x-b-c / A + x-c-a / B + 3 It's better to be careful I'm very sorry. I missed it~ x-a-b/c+x-b-c/a+x-c-a/b+3=3
- 8. A / | a | + | B | / B + C / | C | = 1, then the value of (| ABC | / ABC) ^ 2006 / (BC / | ab | · AC / | BC | · AB / | AC |) is________ .
- 9. Solution 1: given that X: Y: z = 3:4:5, and 3x-4y + Z = - 4, find the value of formula x-3y + 5Z. 2 a batch of manuscripts, a copy 30 hours, B copy 20 hours, now from a copy 3 hours later to B copy the rest, ask B how many hours still need to copy (equation solution)
- 10. Given 3x = 5Y, 4x = 5Z, find the ratio of X and Z. find X: Y: Z Speed before 8:30! 1
- 11. Given x ^ 2-3x + 1 = 0, find the value of algebraic formula x ^ 4 + 1 / x ^ 4 Such as the title
- 12. Known: x ^ 2-3x + 1 = 0, find: algebraic formula x ^ 2 + 1 / x ^ 2 and x ^ 4 + 1 / x ^ 4 value
- 13. Calculation: 5x-2 [3x-2 (3x + 1)]
- 14. It is known that x = 2, y = 1 is the solution of the binary linear equations ax + by = 7, ax by = 1 about x.y=————
- 15. In the triangle ABC, extend AC to point F so that CF = 2 / 1Ac, D and E are the midpoint of edge AB and BC respectively. Prove DC = EF
- 16. It is known that in RT triangle ABC, D is the midpoint of hypotenuse AB, de / / BC, EF / / DC
- 17. As shown in the figure, in RT △ D is the midpoint of the hypotenuse AB, f is the midpoint of AC, EF ‖ DC, intersects the extension line of BC at point E, and proves that the quadrilateral befd is isosceles trapezoid
- 18. It is known that the area of triangle ABC is 42.3 square centimeters, which is six times of the area of triangle EFB, and the area of parallelogram efcd
- 19. In triangle ABC, CD is the angular bisector, CF is the outer angular bisector, DF is parallel, BC intersects AC and E, CF intersects F, and de = EF is proved
- 20. In the acute triangle ABC, ah is high, if AB + BH = HC, prove: angle B = 2, angle c (to process,) In the acute triangle ABC, ah is high, if AB + BH = HC, prove: angle B = 2, angle C