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Dividir 254 en 3 partes tales que la segunda sea el triple de la primera y 40 unidades mayor que la tercera
Dividir 254 en 3 partes tales que la segunda sea el triple de la primera y 40 unidades mayor que la tercera.
x
x + 3x + 3x 40 = 254
1.- 42
3x
3x + 3x + x = 254 + 40
2.- 126
3x 40
7x = 294
3.- 86
La suma de dos nmeros es 100 y el duplo del mayor equivale al triple del menor. Hallar los nmeros.
Datos
Ecuacin
Resultados
menor = x
2(100 x) = 3x
mayor = 44
mayor = 100 x
200 2x = 3x
menor = 66
3(x)
-2 3x = -266
2(100 x)
-5 = -200
La edad actual de A es el doble que la de B y hace 10 aos la edad de A era el triple de la de B. Hallar las edades.
Datos
Ecuacin
Resultados
Actualmente
A = 2x
2x 10 = 3(x 10)
A =
B = x
2x 10 = 3x 30
B =
Hace 10 a 50
2x 3x = -30 + 10)
A = 2x 10
-x = -20
B = 3(x 10)
x = 20
FACTORIZAR
1. 3x2 5x + 2 = 0
(3x2 5x + 2 = 0)3
9x2 15x + 6 = 0
(3x 6)(3x 1) = 0
3 1
(x 2)(3x 1) = 0
3x 1 = 0
3x = 1
x1 = 1/3
x 2 = 0
x2 = 2
2. x2 + 11x = -24
x2 + 11x + 24 = 0
x = (11) ( (11)2 4(1)(24)
Resolver: (x + 4)2 = 2x(5x 1) 7(x 2)
x2 + 8x + 16 = 10x2 2x 7x + 14
x2 + 8x + 16 10x2 + 2x + 7x 14 = 0
(-9x2 + 17x + 2 = 0)-1
9x2 17x 2 = 0
9x2 17x = 2
-17 * 1 = -17 9 9 9 9 2 18
x2 17x + 17 2 = 2 + 17 2
9 18 9 18
x2 17 2 = 2 + 289
18 9 324
Resolver: 1 = 7 11
3x 5x2 60
1 = 7 11 60x23x 5x2 60
20x = 84 11x211x2 + 20x 84 = 0
x = 20 ( (20)2 4(11)(-84)
2(11)
x1 = 2 x2 = -42 / 11
ECUACIONES INCOMPLETAS
1. De la forma ax2 + c = 0
Resolver: x2 + 1 = 7x2 + 3
9
x2 + 1 = 7x2 + 3 9
9
9x2 + 9 = 7x2 + 27
9x2 + 9 7x2 27 = 0
2x2 18 = 0
2x2 = 18
2x2 = 18
2 2
x2 = 9
x2 = ( 9
x = ( 3
x1 = 3
x2 = -3
2. De la forma ax2 + bx = 0
Resolver 5x2 = -3x
5x2 + 3x = 0
x(5x + 3) = 0
5x + 3 = 0
5x = -3
Resolver x2 + 5 = 7
CORRECCIN DEL EXAMEN
Tipo A
1. Factorizar por factor comn.
13a3b5 + 26a2b4 = 13a2b4 (ab + 2)
13a3b5 = 13(a(a(a(b(b(b(b(b
26a2b4 = 2(13(a(a(b(b(b(b
2. Factorizar por diferencia de cuadrados
1 = 25y4 = 1 + 5y2 1 - 5y2 4a2 9 2a2 3 2a 3
1 = 1 f 4a2 2a
25y4 = 5y2 f 9 3
3. Factorizar el binomio cuadrado perfecto
16x4 48x2y4 + 36y8 = (4x2 6y4)24. Factorizar el binomio de la forma:
6x8 + 7x4 5 = 0
(6x8 + 7x4 5) 6=
36x8 + 6(7x4) 30=
(6x4)2 + 7(6x4) 30 =
(6x4 + 10) (6x4 3) = (3x4 + 5)(2x4 1)
2*3
5. Fraccin
6. Ecuacin de segundo grado
(x 2)(x 2) = (3 x)(3 x) + 1
x2 4x + 4 = 9 6x + x2 + 1
x2 4x + 6x x2 = 9 + 1 4
2x = 6
7. Ecuacin de primer grado
5 = 1 f
x2 1 x 1
8. Ecuacin de primer grado
x2 (7x + 6) = x + 59
x2 7x 6 = x + 59
x2 7x 6 x 59 = 0
x2 8x 65 = 0
x2 8x = 65
x2 8x + (4)2 = 65 + (4)2(x 4)2 = 65 + 16
(x 4)2 = 81
(x 4)2 = ( 81
x 4 = ( 9
x1 = 9 + 4 = 13
x2 = -9 + 4 = -5
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