Question

1)Resolva as equações: a)4(x+1)=6 b)5(3x-x)-4x=18 c)9x-3(2x+2x+2)=15 d)2,5(x-2)-1,5x=1 e)3,5x+8=2(x+7) f)6(3x-2)-8=-2 g)-3(x-5)-2(2x+1)= -8 h)5x+4=3x-2x+4 i)4x-10=2x+2 j)2+x=7 k)5x=50 L)-7x=42 m)3x-24=0 n)0,5-x=0,1 o)2x=1 p)9+x=9,4 r)3(2x-1)-2(x-5)=0 Gente É Um Trabalho Pra Hoje...

Answer 1

Solução:
a) 4 (x + 1) = 6
4x + 4 = 6
4x = 6 - 4
4x = 2
x = 2/4 simplifique (÷2)
x = 1/2

b) 5 (3x - x) - 4x = 18
15x - 5x - 4x = 18
10x - 4x = 18
6x = 18
x = 18/3
x = 6

c) 9x - 3(2x + 2x + 2) = 15
9x - 6x + 6x - 6 = 15
9x - 6 = 15
9x = 15 + 6
9x = 21
x = 21/9 simplifique (÷3)
x = 7/3

d) 2,5 (x - 2) - 1,5x = 1
2,5x - 5 - 1,5x = 1
2,5x - 1,5x = 1 + 5
1x = 6
x = 6/1
x = 6

e)3,5x + 8 = 2(x + 7)
3,5x + 8 = 2x + 14
3,5x - 2x = 14 - 8
1,5x = 6
x = 6 / 1,5
x = 4

f) 6(3x - 2) - 8= - 2
18x - 12 - 8 = - 2
18x - 20 = - 2
18x = -2 + 20
18x = 18
x = 18/18
x = 1

g) -3(x - 5) - 2(2x + 1)= - 8
-3x + 15 - 4x -2 = - 8
-3x - 4x = - 8 - 15 + 2
- 7x = - 23 + 2
- 7x = - 21 simplifique ÷(-1)
7x = 21
x = 21/7
x = 3

h)5x + 4 = 3x - 2x + 4
5x - 3x + 2x = 4 - 4
2x - 2x = 0
0 = 0

i) 4x - 10 = 2x + 2
4x - 2x = 2 + 10
2x = 12
x = 12/2
x = 6

j) 2 + x = 7
x = 7 - 2
x = 5

k) 5x = 50
x = 50/5
X = 10

L) -7x = 42
- 7x = 42 simplifique ÷ (-1)
7x = - 42
x = - 42/7
x = - 6

m) 3x - 24 = 0
3x = 24
m = 24/3
m = 8

n) 0,5 - x = 0,1
- x = 0,1 - 0,5 simplifique ÷(-1)
x = - 0,1 + 0,5
x = 0,4

o) 2x = 1
x = 1/2


p) 9 + x = 9,4
x = 9,4 - 9
x = 0,4

r) 3(2x - 1) - 2(x - 5) = 0
6x - 3 - 2x + 10 = 0
6x - 2x = 3 - 10
4x = - 7
x = -7/4