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geometria analitica de lehmann - MATEMATICAS EJERCICIOS ...

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g (* ~ 5) 2 + (y — = t; focos () + VI. - 6), (5 - VI. -6);<br />

9 " 16^ — f" ^ 2~5~~~ = 1 ’ vértices (3, 10) , ( 3 ,0 ) ; e = %.<br />

10. . (* + 2)g + = 1; e = f o c o s ( - 2 + V T s , -l),<br />

( - 2 - V T 5 , - 1 ) .<br />

11. — ■ .iT~ 2)— 1_ (_y 4-4) _ g _ 3^. 2í> = 2 \ / 7 ; longitud <strong>de</strong>l lado rec-<br />

16 7<br />

to = Jí.<br />

13. IT.^ 2 -j- = 1; centro (3, — 2) ; vértices (5, — 2) , (1, — 2) ;<br />

14.<br />

16.<br />

focos (3 -}- %/ 3 , — 2) , (3 — \ / 3 , — 2) * 2a = 4, 2b = 2: longitud<br />

/T<br />

<strong>de</strong>l lado recto = 1; e — —— .<br />

2<br />

~9 ^ ^ ^ ~4 = *; ccntr0 ("“ 4, 1) ; vértices ( — 1, 1), ( —7, 1);<br />

focos (—4 + \ / 5, 1) , ( - 4 — \ / 5, l ) ; 2a = 6, 2 6 = 4 ; longitud<br />

<strong>de</strong>l lado recto = %; e =<br />

^ . . !)— = 1; centro (0, 1); vértices (0, 4), (0, - 2 ) ; focos<br />

(O, 1 + V 5), (0, 1 — y / 5); 2a = 6 , 2 6 = 4 ; longitud d e l lado<br />

recto = %; e =<br />

SOLUCIONES A LOS <strong>EJERCICIOS</strong> 477<br />

20. * 2 + 4t/2 + 2* - 24y + 33 = 0. 26. 3*2 + 4y2 - 24* - 16y + 52 = 0.<br />

22. 4x2 + 9y2 - 16* - 18y - 11 = 0. 27. *2 + 4c/2 + 4x + 16t/ + 4 = 0.<br />

23. 3*2 + 4[/2 + 6* - 8y - 5 =0; 28. 4x2 + y2 - 24* - 2y + 28 = CL<br />

16*2 + 12í/2 + 18* - 2 4 t / - 15 = 0. 29. 4jc2 + y2 - 24* = 0.<br />

24. 3, 3. 30. 100*2 + 8 V “ 163y - 441 = 0;<br />

25. * + 2y— 9 = 0. 36*2 + 20c/2 _ 40y - 25 = 0.<br />

Grupo 29, p. 188<br />

6. 2* — 3y — 5 = 0; 3* + 2y - 1 = 0; V2 V H ; H V U ; J< ; 2s .<br />

7. 9* -j- 51/ — 23 = 0; 5* - 9y - 1 = 0; / 9 \/I06 ; ^ ^ 1 0 6 ; % ;<br />

8. Í0* - 5y - 4 V l 5 = 0; 10* - 5y + 4 \ / l 5 = 0.<br />

9. x — y — 1 = 0; 3x — 3y + 13 = 0.<br />

10. x + y - 2 = 0 ; 9x - 191 y - 218 = 0.<br />

11. a) — 7 < k < 5%; 6) k = -7, /3; c) k < - 7 . k > ^ ' 3.<br />

12. 68° 12'. 20. ( 1 ,1 ), ( - > % ) , 2?í). 22. 3* 4- 7y - 2 = 0.

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