Question

8.1) Calcule as equações; simplifique o resultado sempre que possível:

a) x – 2 = 10


b) 8x – 9 = 2x + 11


c) 2 . (7x + 2) + 12 . (x + 1) = 2


d) x – 3 + 2x - 1 = 15

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2

e) 5(x – 1 ) + 2 x = x – 1 + x

___ ___ _____

2 3 2

Answer 1

Resposta:

1-a)x=10+2

x=12

b)8x-2x=11+9

6x=20

x=20/6

x=3,33

c)14x+4+12x+12=2

27x=2-4-12

27x= -14

d)3x+4=15

3x=15-4

3x=11

x=11/3

x=3,67

2-e)5x-5+2x=2x-1

5x+2x-2x= -1+5

5x=4

x=4/5

x=0,8

Answer 2

✔OLÁ!!!

$a)x - 2 = 10 \\ x = 10 + 2 \\ x = 12$

$b)8x - 9 = 2x + 11 \\ 8x - 2x = 11 + 9 \\ 6x = 20 \\ x = \frac{20}{6} \div 2 \\ x = \frac{10}{3}$

$c)2.(7x + 2) + 12.(x + 1) = 2 \\ 14x + 4 + 12x + 12 = 2 \\ 26x + 16 = 2 \\ 26x = 2 - 16 \\ 26x = - 14 \\ x = - \frac{14}{26} \div 2 \\ x = - \frac{7}{13}$

$d)x - 3 + 2x - 1 = 15 \\ 3x - 4 = 15 \\ 3x = 15 + 4 \\ 3x = 19 \\ x = \frac{19}{3}$

$e)5(x - 1) + 2x = x - 1 + x \\ 5x - 5 + 2x = 2x - 1 \\ 7x - 2x = - 1 + 5 \\ 5x = 4 \\ x = \frac{4}{5}$