Question

resolva as equações:

a) 2(×+1)=-7
b)
$\frac{x}{5} = 25$

c) 4x-8+4=3×+9
d) -12x=4
e) 12+1=13x+4
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Answer 1

Resposta:

a) x = -9/2

b) x = 125

c) x = 13/3

d) -4/12 = x

e) 9/13 = x

explicação:

a) 2×(x+1) = -7

2x+2 = -7

2x = -7-2

2x = -9

x = -9/2

b) x/5 = 25

x/5 = (5÷1×25)/5

x/5 = 125/5

x = 125

c) 4x-8+4 = 3x+9

4x-x = 9+8-4

3x = 17-4

3x = 13

x = 13/3

d) -12x = 4

-4 = 12x

-4/12 = x

e) 12+1 = 13x+4

12+1-4 = 13x

13-4 = 13x

9 = 13x

9/13 = x

Answer 2

Explicação passo-a-passo:

2(x+1)=-7

2x+2=-7

2x=-7-2

2x=-9

x=-9/2

x/5=25

x=25*5

x=125

4x-8+4=3×+9

4x-4=3x+9

4x-3x=9+4

x=13

-12x=4

x=-4/12(÷4)

x=-1/3

12+1=13x+4

13=13x+4

-13x=4-13

-13x=-9(-1)

13x=9

x=9/13