Respuestas
Ejercicio a
2/5 + 3.25x = (3x+5)/2
4/5+6.50x = 3x+5
-3x +6.50x = 5 - 4/5
3.5x = 4.2
x = 1.2
Ejercicio b
0.75(1.1 + 2/9x) =4/5 + x
3/4(10/9 + 2/9x) = 4/5 + x
5/6 + 1/6x = 4/5 + x
1/30 = 5x/6
6/30 = 5x
x = 1/25
Ejercicio c
5/6 + 0.6x = (3+x)/2 - 3/4
5/6 + 2/3x = (3+x)/2 - 3/4
19/12 + 2/3x = (3+x)/2
38/12 + 4/3x = 3+x
1/6 = -x/3
x = -1/2
Ejercicio d
0.4 + (1-x)/2 = -0.25x - (3-2x)/4
2/5+ (1-x)/2 = -x/4 -(3-2x)/4
4/5+(1-x) = -2x/4 -2(3-2x)/4
16/5 +4 - 4x = -2x -6 + 4x
66/5 = 6x
x = 11/5
Ejercicio e
(4x-9) /10 +5/4 = (2-x)/5 (3.75)
(4x-9) /10 +5/4 = 15(2-x)/20
(4)(20)(4x-9) + 20(50) = 600(2-x)
320x -720 + 1000 = 1200 - 600x
920x = 920
x = 920/920
x = 1
Ejercicio f
1/2x - (7x-14)/10 - 5/2 = (3-2x)/5
5x - 7x + 14 - 25 = 2(3-2x)
-2x -11 = 6 - 4x
2x = 17
x = 17/2
Plantea y responde
a) x - 2/9x -3/5x = 288
9x -2x - 27x/5 = 2592
35x - 27x = 12960
x = 12960/8
x = 1620
Tenia = $ 1620
b) 4/7x +5/8(3/7x) +90 = x
4-/7x -15x/56 + x = 90
9x/56 = 90
9x = 5040
x = 5040/9
x = 560
La longitud del trayecto es de 560 km