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RESPUESTAS4 5 7 3. EJERCICIO 280 . 1 (x-7)(x-9) . 2 . (x+11)(x+13) . 3 . (x-31)(x+5) . 4 . (2x-3)(x+'_') . 5 . (4x-1)(3x+2) . 6 . (5x+1)(x+8) . 7 . (6x-5)(x+2) . 8 . (4x-3)(3x-4) .9 . (4x+7)('2x+9) . 1o (9x+7)(3x+1) . 11 . (6x-5)(5x-6) . 12 . (11x+12)(x-15) .13 . (3+x)(2-x) . 14 . (5+x)(1-2x) . 15 . (3+2x)(5-2x) . 16 . (1+4x)(4-3x) .17 . (8x-7)(9x+1) . 18 . (6x+ .1)(6-5x) . 19 . (10x-3)(x+21) . 20 . (20+x)(5-x) .21 . (x-1)(18x+49) . 22 . (3x-2a)(2x+a) . 23 . (5x-3y)(x+5y) . 24. (3x-7m)(5x+m) .EJERCICIO 282 . 1 . 1, -1, i, -i . 2 -1, 1+ice 1-i -v/3 3 . 3, -3, 3i, -3i .2 24 . 4, -4, 4i, -4i . 5 . -2, 1+iv3, l-iv3. 6 . 5, -5, 5i, -5i . 7 . -4, 2+2V3i,3+3v3i 3-3 íi2-2fi . 8 . 3,22 2 29 . 2, -1+iv3,-1-iV3. 10 . 2V' , -2v', 2 ,./2t, -2V2- i.EJERCICIO 283 . 1 . ±- 1, ±3 . 2. ±2, ±3 . 3 . ±2, ±5 . 4. ±5, ±6 .5 . :t1, ±2i . 0 . ±3, ±5i . 7 . i- 7, ±2i . 8 . ±1, {-' 9 . ±3, i--1 . 10 . ±2, ± 211 .á*- 12 . 2 iv3 .s , i . -±: 1 , ± 13 . -±- 2, -t y V`6-G¡. 14 . i- 1, t Í VII . 3 .EJERCICIO 284 . 1 . -1, 2. 2 . -3, - . 3 . 3, -C12-- 1+va, ± 25 . 1,2 . 6.±1 + 1 1 '8 . 1--1 .3 1 2' 9.1,4 .3 • 10 .3'11 . 25,9 . 12 . 16, 10 .EJERCICIO 285 . 1 . v+v . 2. \-V3 . 3 . 1+V7. 4. 5-V7 .6 . V'2-+,,/1--1 . 7 . ',/5-+VI-. 8 . 9-Va. 9 . -VG+f15 . 10 . v'7+Vl . 11 . 2v'J-v .12. 3V + ,V10. 13 . 3v'-2v'. 14. 15-2v' . 15. 5 11-3v' . 16 . 2 ~/''+ v3.17 . ~- 9. 18 . -1 + 1 v2. 19. 2+V . 20. 2+v3 . 21 . 1+N/7 . 22 . V/3+ V`7 .23 . f3+Y15. 24 . V1-3-11 . 25 . 2-,,í5---.,/-10 . 26 . N/'3-+v6 . 27 . 3 -%/10-2\/2-.EJERCICIO 286 . 1 . 31 . 2 . 60 . 3 . 150 . 4 . 437 . 5 . -44 . 6 . -170-7 . -45 . 8 . -416 . 9 . 113 . 10 . 152 . 11 . 34 . 12 . 33. 13 . 2f 14 . 10 1, .15 . 49 . 16. -149. 17 . -12A . 18 . -7 R . 19 . -24-1 . 20 . 88 . 21 . -203 .22 . -11. 23 . 21 1(l . 24 . 56 . 25 . -158'-.3EJERCICIO 287 . 1 . 16 . 2 . -111 . 3 . -1 . 4 . 43. 5 . 1 . 6 .8 . -5 . 9 . 12 . 10 . 14 . 11 . 40 . 12 . 17 .-3.7 . -, 7 -EJERCICIO 288 . 1 . 232 . 2 . 1786 . 3 . -1752 . 4 . 11840 . 5 . --17040 . 6 . -10050 .7 . 221 . 8 . 13 3 . 9 . 1421. 10. -139?. 11 . 692- . 12. 563-1 . 13 . 272 . 14. -35' .10 2 5 3 2 4EJERCICIO 289. '1 . +3 . 5. 7 . 9 . 11 . 2 . +19 . 16 . 13 . 10 . 7 . 4 . 1 . -2 . -5-3 . +-13 . -23 . -33 . -43 . -53 . -63 . -73 . 4 . --42 . -23 . -4. 15 . 34 . 5 3 . 5 . --81 .-69 . -57 . -45 . -33 . -21 . -9 . 6 . -.1 . 1 1, . 2 . 21 . 3. 7 . ±5 . 65 . 75 . 95. 10$ . 12 .5 2 1 5 3 31 18 7 1 11 1 88 . --4 . -2- . -1- . -- -2 . --a 3 2' 316 . 3 . 9 . 4 4810 • ' -1 .24' 16 8 48 81 5 2 0 3 2 77 29 13 1 1 3 3 17 . 7. 1 7 . 17 . 27. 3 . 11 . _ 3 144 .144' 72'- K . 12 . --2 . -2- -2-4 .48 -3 1311 .7 •-3 1 - . -3 7 S . -41 . 4 -4-1- 8 --5 .1 11 7 1 1 1 - 8 - 13 . 17 72 30 30 10 30 0 10 80 80 10

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