Question

Determine a raiz das seguintes equações do 1 grau com uma incógnita :
a) x/2 + 1 = x/5 + 1/4
b) x/4 + x/3 = x - 100
c) 2x/3 + 5x/6 =1/2
d) x/5 = 21 - x/2
e) 4/5 + 3x/4 = 1/10 + x
f) 1/6 - x/2 = 2x/3 + 1/4
g) x/2 + x/5 - x/10 = 1 - 4x/5
h) 7x/20 - 2x/5 + x/4 + 3x/20 = 1/10

Answer 1

a) 10x+20=4x+5
10x-4x=-20+5
x=-15/6

b) x/4+x/3=x-100
m.m.c
3x+4x=12x-1200
-5x=-1200
x=-1200/-5

c) 2x/3+5x/6=1/2
m.m.c
8x+10x=6
x=6/18

d) x/5=21-x/2
m.m.c
2x+5x=210
x=210/7

e)4/5+3x/5=1/10+x
m.m.c
16+15x=2+20x
-5x=-14
x=-15/-14

f) 1/6-x/2=2x/3+1/4
m.m.c
2-6x=8x+3
-14x=1
x=1/-14

g) x/2+x/5-x/10=1-4x/5
m.m.c
5x+2x-x=10-8x
x=10/14

h) 7x/20-2x/5+x/4+3x/20=1/10
m.m.c
7x-8x+5x+3x=
7x=2
x=2/7