3°Resolva as seguintes equações
A) 4x-1=3
B)3(x-2)=2x-4
C)2(x-1)=3x+4
D)3(x-1)-7=15
E)7(x-4)=2x-3
F)3(x-2)=4(3-x)
G)3(3x-1)=2(3x+2)
H)7(x-2)=5(x+3)
I)3(2x-1)=-2(x+3)
j)5x-3(x+2)=15
K)2x+3x+9=8(6-8)
L)4(x+10)-2(x-5)=0
M)3(2x+3)-4(x-1)=3
N)7(x-1)-2(x-5)=x-5
O)2(3-x=3(x-4)+15
P)3(5-x)-3(1-2x)=42
Q)(4x+6)-2x=(x-6)+10+14
R)(x-3)-(x+2)+2(x-1)-5-0
S)3x-2(4x-3)=2-3(x-1)
T)3(x-1)-(x-3)+5(x-2)=18
U)5(x-3)-4(x+2)=2+3(1-2x)
me desculpa e pq isso e avaliação e meu professor e um capeta mesmo obgda pra quem responder tds
Respostas
a) 4x - 1 = 3
4x = 3 + 1
4x = 4
x = 4
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4
x = 1
b) 3(x - 2) = 2x - 4
3x - 6 = 2x - 4
3x - 2x = - 4 + 6
x = 2
c) 2(x - 1) = 3x + 4
2x - 2 = 3x + 4
2x - 3x = 4 + 2
- x = 6 . (-1)
x = - 6
d) 3(x - 1) - 7 = 15
3x - 3 - 7 = 15
3x = 15 + 3 + 7
3x = 25
x = 25
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3
e) 7(x - 4) = 2x - 3
7x - 28 = 2x - 3
7x - 2x = - 3 + 28
5x = 25
x = 25
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5
x = 5
f) 3(x - 2) = 4(3 - x)
3x - 6 = 12 - 4x
3x + 4x = 12 + 6
7x = 18
x = 18
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7
g) 3(3x - 1) = 2(3x + 2)
9x - 3 = 6x + 4
9x - 6x = 4 + 3
3x = 7
x = 7
---
3
h) 7(x - 2) = 5(x + 3)
7x - 14 = 5x + 15
7x - 5x = 15 + 14
2x = 29
x = 29
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2
i) 3(2x - 1) = - 2(x + 3)
6x - 3 = - 2x - 6
6x + 2x = - 6 + 3
8x = - 3
x = - 3
---
8
j) 5x - 3(x + 2) = 15
5x - 3x - 6 = 15
5x - 3x = 15 + 6
2x = 21
x = 21
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2
k) 2x + 3x + 9 = 8(6 - 8)
2x + 3x = 8(6 - 8) - 9
5x = 8(-2) - 9
5x = - 16 - 9
5x = - 25
x = - 25
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5
x = - 5
l) 4(x + 10) - 2(x - 5) = 0
4x + 40 - 2x + 10 = 0
4x - 2x = - 10 - 40
2x = - 50
x = - 50
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2
x = - 25
m) 3(2x + 3) - 4(x - 1) = 3
6x + 9 - 4x + 4 = 3
6x - 4x = 3 - 9 - 4
2x = 3 - 13
2x = - 10
x = - 10
---
2
x = - 5
n) 7(x - 1) - 2(x - 5) = x - 5
7x - 7 - 2x + 10 = x - 5
7x - 2x - x = - 5 + 7 - 10
7x - 3x = - 15 + 7
4x = - 8
x = - 8
---
4
x = - 2
o) 2(3 - x) = 3(x - 4) + 15
6 - 2x = 3x - 12 + 15
- 2x - 3x = - 12 + 15 - 6
- 5x = - 18 + 15
- 5x = - 3 . (-1)
5x = 3
x = 3
---
5
p) 3(5 - x) - 3(1 - 2x) = 42
15 - 3x - 3 + 6x = 42
- 3x + 6x = 42 - 15 + 3
3x = 30
x = 30
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3
x = 10
q) (4x + 6) - 2x = (x - 6) + 10 + 14
4x + 6 - 2x = x - 6 + 10 + 14
4x - 2x - x = - 6 + 10 + 14 - 6
4x - 3x = - 12 + 24
x = 12
s) 3x - 2(4x - 3) = 2 - 3(x - 1)
3x - 8x + 6 = 2 - 3x + 3
3x - 8x + 3x = 2 + 3 - 6
3x - 5x = 5 - 6
- 2x = - 1 . (-1)
2x = 1
x = 1
---
2
t) 3(x - 1) - (x - 3) + 5(x - 2) = 18
3x - 3 - x + 3 + 5x - 10 = 18
3x - x + 5x = 18 + 3 - 3 + 10
1x + 5x = 18 + 10
6x = 28
x = 28 (÷2)
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6 (÷2)
x = 14
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3
u) 5(x - 3) - 4(x + 2) = 2 + 3(1 - 2x)
5x - 25 - 4x - 8 = 2 + 3 - 6x
5x - 4x + 6x = 2 + 3 + 25 + 8
x + 6x = 38
7x = 38
x = 38
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7