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(A) 3x + 2 = x + 1
(B) 5x = 5
(C) 10m + 3 = m
(D) 2x - 8 = 3x - 10
(E) - 5x + 50 = 5x
(F) 20x - 140 = -5x
(G) 20x = -20
(H) x + 4 = 2x -3
(I) 2 + 2x = 24 - 9x
Soluções para a tarefa
Resposta:
a)x=-1/2
b)x=1
c)x=-1/3
d)x=2
e)x=5
f)x=28/5
g)x=-1
h)x=7
i)x=2
Explicação passo-a-passo:
a) 3x+2=x+1
3x-x=1-2
2x=-1
x=-1/2
b)5x=5
x=5/5
x=1
c)10m+3=m
10m-m=-3
9m=-3
m=-3/9. {-3÷3=-1}/{9÷3=3}
m=-1/3
d)2x-8=3x-10
2x-3x=-10+8
-x=-2. x(-1)
x=2
e)-5x+50=5x
-5x-5x=-50
-10x=-50. x(-1)
10x=50
x=50/10
x=5
f)20x-140=-5x
20x+5x=140
25x=140
x=140/25. {140÷5=28}/{25÷5=5}
x=28/5
g)20x=-20
x=-20/20
x=-1
h)x+4=2x-3
x-2x=-3-4
-x=-7. x(-1)
x=7
i)2+2x=24-9x
2x+9x=24-2
11x=22
x=22/11
x=2
Resposta:
Explicação passo-a-passo:
A)
3x + 2 = x + 1
3x-x= 1 - 2
2x = - 1
x = - 1/2
(B)
5x = 5
x = 5/5
x = 1
(C)
10m + 3 = m
10m - m = 3
9m = 3 (:3)
3m = 1
m = 1/3
(D)
2x - 8 = 3x - 10
-8+10= 3x-2x
2 = x
x = 2
(E)
- 5x + 50 = 5x
50= 5x+5x
50= 10x
50/10= x
5 = x
x = 5
(F)
20x - 140 = -5x
20x+5x = 140
25x = 140 (:5)
5x = 28
x = 28/5
(G)
20x = -20
x = -20/20
x = - 1
(H)
x + 4 = 2x -3
4+3= 2x-x
7= x
x = 7
(I)
2 + 2x = 24 - 9x
2x+9x = 24-2
11x = 22
x = 22/11
x = 2