Question

1°)RESOUVA AS EQUAÇÕES ABAIXO:a)x-3=9 b)9x-4x+10=7x-30
C)x+5=20-4
D)4x-9=1-2x

Answer 1

Resposta:

A)x=12

B)x=20

C)x=11

D)x=5/3

Explicação passo-a-passo:

A)x-3=9

x-3=9

x=9+3

x=12

resposta

x=12

B)9x-4x+10=7x-30

9x-4x+10=7x-30

9x-4x

(9-4)x

5x

9x-4x+10=7x-30

5x+10=7x-30

5x+10-7x=-30

5x+10-7x=-30-10

(5x-7x)

(5-7)x

-2x

5x-7x=-30-10

-2x=-30-10

-30-10

-(30+10)

-40

-2x=-30-10

-2x=-40

-1×(-2)x=-1×(-40)

2x=-1×(-40)

2x=1×40

2x=40

-2x=-40

2x=40

2x÷2=40÷2

x=40÷2

x=20

2x=40

x=20

resposta

x=20

C)x+5=20-4

x+5=20-4

x+5=16

x=16-5

x=11

resposta

x=11

D)4x-9=1-2x

4x-9=1-2x

1-2x

-2x+1

4x-9-1-2x

4x-9=-2x+1

4x-9+2x=1

4x+2x=1+9

4x+2x

(4+2)x

6x

4x+2x=1+9

6x=1+9

6x=10

6x÷6=10÷6

x=10÷6

x=5/3

6x=10

x=5/3

resposta

x=5/3