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211.2. Identity.

Check the correct answer!

Is the given expression an identity?
1+2+3+4+5+6+7+8+9=9-8-7-6-5-4-3-2-1+40
Grade:
7
Subject
Algebra
Theme
Simple algebric expression transformation
Subtheme
Identity

Solve tasks to find hidden Geo point coordinates

  1. Algebra: Identity.
  2. Algebra: Ordinary and decimal fractions
  3. Algebra: Contracted multiplication formula: addition and subtraction square; square difference.
  4. Geometry: Equal figures, line segments, lengths, midpoints, distance between two points.
  5. Algebra: Mutually equal monomials
  6. Algebra: Equation properties.
  7. Algebra: Ordinary and decimal fractions
  8. Algebra: Numerical connections
  9. Algebra: Fraction (division) basic properties
  10. Geometry: Concept definition, concept sign.
  11. Algebra: Mathematics expression. Algebraic expression.
  12. Algebra: Ordinary and decimal fractions
  13. Geometry: Three point mutual arrangement.
  14. Algebra: Trinomial.
  15. Algebra: Opposite type inequalities.
  16. Algebra: Conditioned inequality properties
  17. Geometry: Three point mutual arrangement.
  18. Algebra: Equation properties.
  19. Algebra: Polynomial.
  20. Algebra: Subscript concept: base, index, degree
  21. Algebra: Ordinary and decimal fractions
  22. Algebra: Number gap and their types.
  23. Algebra: Opposite type inequalities.
  24. Algebra: Numerical normal form
  25. Algebra: Numerical module
  26. Geometry: Concept definition, concept sign.
  27. Algebra: Polynomial opposite polynomial.
  28. Geometry: Broken line and elements, elementary broken line, closed broken line, broken lines length, polygon, angles, edges peaks, diagonal, polygon perimeter.
  29. Algebra: Monomial normal form
  30. Geometry: Opposite, adjacent angles, perpendiculars against a straight line.
  31. Algebra: Numerical inequalities and their properties.
  32. Geometry: Point belongs (or not) to the straight line (beam, line segment), half-plane, crossed straight lines, beam, opposite beams, line segment, properties.
  33. Algebra: Monomial fraction form
  34. Algebra: Polynomial opposite polynomial.
  35. Algebra: Connection concept
  36. Algebra: Monomial coefficient
  37. Algebra: Number interval and their types.
  38. Algebra: Identity.
  39. Algebra: Equivalent equations.
  40. Algebra: Fraction (division) basic properties
  41. Algebra: Conditioned inequality properties
  42. Geometry: Isosceles triangle, sidewall, basis, equilateral triangle, line segment mid-perpendicule, connection between angles and edges in triangle.