Question

atividade de Matemática URGENTE :Montar a conta​

Answer 1

Resposta:

a)

$7 + 2.(x - 1) = x \\ \\ 7 + 2x - 2 = x \\ \\ 2x - x = - 7 + 2 \\ \\ \green{x = - 5}$

b)

$6 + 3.(x - 1) = 2x \\ \\ 6 + 3x - 3 = 2x \\ \\ 3x - 2x = - 6 + 3 \\ \\ \green{x = - 3}$

e)

$- 8 - (2 + x) = 7\\ \\- 8 - 2- x = 7\\ \\- 8 - 2 - 7 = x\\ \\ \green{x = - 17}$

f)

$9 - (1 - x ) = 0\\ \\ 9 - 1 + x = 0\\ \\ x = - 9 + 1\\ \\ \green{x = - 8}$

i)

$5x - (x + 5) = 5\\ \\5x - x - 5 = 5\\ \\ 5x - x = 5 + 5\\ \\ 4x = 10\\ \\ x = \dfrac{10÷2}{4÷2}\\ \\\green{ x = \dfrac{5}{2}}$

j)

$- 1 + 2•(1 - x) = x \\ \\ - 1 + 2 - 2x = x \\ \\ 2x - x = + 1 - 2\\ \\ \green{x = - 1}$

m)

$14 - 3•(x + 1) = 2x\\ \\ 14 - 3x - 3 = 2x \\ \\ 14 - 3 = 2x + 3x \\ \\ 11 = 5x \\ \\ \green{ \dfrac{11}{5}}$

n)

$7 - 7•(x - 1) = 2x\\ \\ 7 - 7x + 7 = 2x \\ \\ 7 + 7 = 2x + 7x \\ \\ 14 = 9x \\ \\ \green{x = \dfrac{14}{9}}$

Bons Estudos!

Answer 2

Explicação passo-a-passo:

Resolução!!!

7+2(x-1)=x

7+2x-2=x

5+2x=x

2x-x=-5

x=-5

6+3(x-1)=2x

6+3x-3=2x

3+3x=2x

3x-2x=-3

x=-3

-8-(2+x)=7

-8-2-x=7

-10-x=7

-x=7+10

-x=17(-1)

x=-17

9-(1-x)=0

9-1+x=0

8+x=0

x=0-8

x=-8

5x-(x+5)=5

5x-x-5=5

4x-5=5

4x=5+5

4x=10

x=10/4(÷2)

x=5/2

-1+2(1-x)=x

-1+2-2x=x

1-2x=x

-2x-x=-1

-3x=-1(-1)

x=1/3

14-3(x+1)=2x

14-3x-3=2x

11-3x=2x

-3x-2x=-11

-5x=-11(-1)

x=11/5

7-7(x-1)=2x

7-7x+7=2x

14-7x=2x

-7x-2x=-14

-9x=-14(-1)

x=14/9

Espero ter ajudado!