By Sergueï Sakhno

Les mots ont une " mémoire " secrète : leur histoire, c'est celle de nos cultures, de notre pensée collective inconsciente. A ce titre, le russe a une grande valeur pédagogique, similar à celle du latin ou du grec, pour faire comprendre à un francophone l. a. formation et le fonctionnement de sa propre langue, le français, et pour lui faire mieux connaître les autres principales langues européennes.

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**Additional info for Dictionnaire Russe-Francais d'etymologie comparee : Correspondances lexicales historiques French**

**Sample text**

Write the answer using scientiﬁc notation. 79. S. Roadways. S. roadways in a recent year (Source: Keep America Beautiful). On average, how many pieces of trash were on each mile of roadway? Convert to scientiﬁc notation. 51. 16,500,000 52. 359,000 53. 000000437 54. 0056 55. 234,600,000,000 56. 8,904,000,000 57. 00104 58. 00000000514 59. Mass of a Neutron. 00000000000000000000000000167 kg. 60. Tech Security Spending. It is estimated that $37,800,000,000 will be spent on information technology security systems in 2013 (Source: IDC).

T 3 + 6t 2 - 2t - 12 Factor the sum or the difference of cubes. 68. y 3 - 8 67. x 3 + 64 17. a - 3a - 2a + 6 3 2 18. x 3 - x 2 - 6x + 6 69. m3 - 216 70. n3 + 1 71. 8t 3 + 8 72. 2y 3 - 128 Factor the trinomial. 19. w 2 - 7w + 10 20. p2 + 6p + 8 73. 3a 5 - 24a 2 74. 250z 4 - 2z 21. x + 6x + 5 22. x - 8x + 12 75. t 6 + 1 76. 27x 6 - 8 23. t 2 + 8t + 15 24. y 2 + 12y + 27 2 25. x - 6xy - 27y 2 2 2 26. t - 2t - 15 2 Factor completely. 77. 18a 2b - 15ab 2 78. 4x 2y + 12xy 2 27. 2n2 - 20n - 48 28. 2a 2 - 2ab - 24b 2 79.

B) 25y 2 - 30y + 9 Solution A2 + 2 и A и B + B 2 = 1A + B22 a) x 2 + 8x + 16 = x 2 + 2 и x и 4 + 42 = 1x + 422 28 CHAPTER R Basic Concepts of Algebra A2 - 2 и A и B + B 2 = 1 A - B22 b) 25y 2 - 30y + 9 = 15y22 - 2 и 5y и 3 + 32 = 15y - 322 a Now Try Exercises 57 and 59. We can use the following rules to factor a sum or a difference of cubes: A3 + B 3 = 1A + B21A2 - AB + B 22; A3 - B 3 = 1A - B21A2 + AB + B 22. These rules can be veriﬁed by multiplying. EXAMPLE 10 a) x 3 + 27 Factor each of the following.