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# VIII.8 . Formule de calcul prescurtat

Rezolvati exercitiile mai intai pe caiet.

1. (a - b %2b c)² = #
a^2%2b2a%2b1, , ,
2. N = #
a^2-4a%2b4, , ,
3. (a - b - c)² = #
4a^2%2b4a%2b1, , ,
4. A %2b B = #
9a^2-12a%2b4, , ,
5. (2a %2b1)² = #
9m^2-30mn%2b25n^2, , mix questions ,
6. A %2b B %2b C = #
7-formule de calcul prescurtat.JPG, , language ,
7. FORMULE DE CALCUL PRESCURTAT (a %2b b)² = a² %2b 2ab %2b b² (a - b)² = a² - 2ab %2b b² (a %2b b %2b c)² = a² %2b b² %2b c² %2b 2ab %2b 2bc %2b 2ac a² - b² = (a - b)(a %2b b) ATENTIE: pentru a tasta rezultatele cerute nu lasati spatii intre simboluri iar pentru puterea a² folositi simbolul ^ ex.: a²=a^2 m²=m^2 x²%2b5x-4=x^2%2b5x-4
5, language , ,
8. A %2b B %2b C = #
25, invite students , ,
9. A %2b B %2b C = #
56, , ,
10. (3a - 2)² = #
2, , ,
11. (a - 2)² = #
15, help students assimilate material , ,
12. P = #
37, , ,
13. (3m - 5n)² = #
1, , ,
14. A %2b B = #
2, , ,
15. A %2b B %2b C = #
-13, , ,
16.
34, invite students , ,
17. (a %2b b %2b 1)² = #
3, , ,
18. P = #
a^2%2bb^2%2b2ab%2b2a%2b2b%2b1, , ,
19. (a %2b 1) ² = #
a^2%2bb^2%2bc^2-2ab%2b2ac-2bc, , ,
20. A %2b B %2b C = #
a^2%2bb^2%2bc^2-2ab-2ac%2b2bc, , ,