Question

conta completa por favor​

Answer 1

Resposta:

9cm

Explicação passo-a-passo:

8 - 6

12- x

8x = 72

x = 72/8

x = 9

Answer 2

Resposta:

Explicação passo-a-passo:

1°)

y = 3

x = 8

4/3 = (4+x)/9

4/1 = (4+x)/3

4.3 = (4+x)

12 = 4+x

12-4= x

8 = x

x = 8

4/8 (:4)/(:4) = y/6

1/2=y/6

1/1 = y/3

3 = y

y = 3

(Ok)

__________

2°)

A)

4/5 = (4+4)/x

4/5=8/x

1/5 = 2/x

x= 2.5

x= 10

Y/5 = (y+6)/x

Y/5 = (y+6)/10

Y/1 = (y+6)/2

2y = y+6

y = 6

3°)

B)

6/10 (:2)/(:2) = (6+y)/15

3/5= (6+y)/15

3/1 = (6+y)/3

3.3 = 6+y

9 = 6 + y

9-6= y

3 = y

y = 3

X/10=(x+4)/15

X/2 = (x+4)/3

3x = 2(x+4)

3x = 2x + 8

3x - 2x = 8

x= 8

________

4°)

C)

15/(y+18) = 10/18 (:2)/(:2)

15/(y+18) = 5/9

3/(y+18)= 1/9

3.9 = y+18

27 = 18 + y

27-18= y

y = 9

X/18= (10+x)/(y+18)

X/18 = (10+x)/(9+18)

X/18 = (10+x)/27

X/2 = (10+x)/3

3x = 2.(10+x)

3x= 2x + 20

3x - 2x = 20

x = 20

________

5°)

8/12 (:4)/(:4) =6/x

2/3 = 6/x

2x = 3.6 (÷2)

x = 3.3

x = 9