Respostas
Resposta:
a
b
c
d
e
f
Resposta:
a) x/2 +1 = x/5 + 1/4 ..................... mmc = 20
10x + 20 = 4x + 5 .................... o mmc
10x -4x = 5 -20
6x = -15
x = -15/6 simplificando por 3
x = -5/3
b) x/4 + x/3 = x - 100 mmc = 12
3x + 4x = 12x - 1200
3x +4x -12x = -1200
-5x = -1200
x = -1200/-5
x = +240
c) 2x/3 + 5x/6 = 1/2 mmc = 6
4x + 5x = 3
9x = 3
x = 3/9 simplificando por 3
x = 1/3
d) x/5 = 21 - x/2 mmc = 10
2x = 210 - 5x
2x +5x = 210
7x = 210
x = 210/7
x = 30
e) 4/5 + 3x/4 = 1/10 + x mmc = 20
16 + 15x = 2 + 20x
15x -20x = 2 - 16
-5x = -14
x = -14/-5 (-)
x = 14/5
f) 1/6 - x/2 = 2x/3 + 1/4 mmc = 12
2 - 6x = 8x + 3
-6x -8x = 3 -2
-14x = 1
x = -1/14
Explicação passo a passo: