Algebra
Enviado por lirio97 • 10 de Agosto de 2015 • Apuntes • 1.068 Palabras (5 Páginas) • 130 Visitas
Operaciones de primer grado
1.-
3x + 5 – 2x + 6x = 4x + 8
7+5 = 4x + 8
7x – 4x =8 – 5
3x = 3
x = 3/3
2.- 3(x + 5) + 2x = 7x + 9
3 (x + 5) + 2x = 7x + 9
3x + 2x – 7x =9 – 15
5x – 7x = - 6
2x = [pic 1]
x = 3
3.- = x + 1 [pic 2]
5x + 2 = (x + 1) 4
5x + 2 = 4x + 4
5x – 4x = 4 – 2
X = 2
4.-
= 4 (x – 1)+ 3 [pic 3]
= 4 x - 4 + 3[pic 4]
3x + 6 = 4x – 4 + 3 (2)
3x + 6 = 8x – 8 + 6
3x + 6 = 8x – 2
3x – 8x = - 2 – 6
-5x = 8
X = 8/5
5.-
+ = 2 x[pic 5][pic 6]
X = 5 (4x – 6) + 3 {2 (x + 4)}=2x
5 (4x – 6) + 3 [2 (x + 4)] = 15 (2x)
20x – 30x + 3 (2x + 8) = 15 (2x)
20x – 30 + 6x + 24 = 30x
20x + 6x – 30x = - 24 + 30
26x – 30x = 6
-4x = 6
X = 6/-4
x = 3/2
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