a)3+x=0
b)23x+2=2
c)12-7+4x=25
d)5x-3x=30
e)4x+10=45-3x
f)x+30=40
g)30-20+2x=10?
h)3x-10+13=-2x+28
i)20x-30=40+30-20
j)-5x+45-89=-90+41
k)10x-20=40+50
l)20-80+2x=10
m)19+2x-13=10-20
n)10x-12+10=+18-20
o)13x-23-45=-7x+12
Tem como alguém me ajudar pfv?
Soluções para a tarefa
Resposta:
a) 3 + x = 0
x = -3, pois 3 + (-3) = 0
b) 23x + 2 = 0
23x = 2 - 2
23x = 0
23 . 0 = 0
x = 0
c) 12 - 7 + 4x = 25
5 + 4x = 25
4x = 25 - 5
4x = 20
x = 5
d) 5x - 3x = 30
2x = 30
x = 15
e) 4x + 10 = 45 - 3x
4x + 3x = 45 - 10
7x = 35
x = 5
f) x + 30 = 40
x = 40 - 30
x = 10
g) 30 - 20 + 2x = 10
10 + 2x = 10
2x = 10 - 10
2x = 0
x = 0
h) 3x - 10 + 13 = -2x + 28
3x + 3 = -2x + 28
3x + 2x = 28 - 3
5x = 25
x = 5
i) 20x - 30 = 40 + 30 - 20
20x = 40 + 30 - 20 + 30
20x = 80
x = 4
j) -5x + 45 - 89 = -90 + 41
-5x - 44 = -90 + 41
-5x = -49 + 44
-5x = -5 .(-1)
5x = 5
x = 1
k) 10x - 20 = 40 + 50
10x = 90 + 20
10x = 110
x = 11
l) 20 - 80 + 2x = 10
2x = 10 + 60
2x = 70
x = 35
m) 19 + 2x - 13 = 10 - 20
2x = 10 - 19 + 13
2x = 4
x = 2
n) 10x - 12 + 10 = 18 - 20
10x = -2 + 2
10x = 0
x = 0
o) 13x - 23 - 45 = -7x + 12
13x + 7x = 12 + 68
20x = 80
x = 4