Question

encontra o valor de X e resolver as outra nao to conseguino

Answer 1

b)

3/x=2/4

3/x=1/2

x=3(2)

x=6

Os outros são semelhantes

e)

2x/3/10=x/y

2/30=1/y

1/15=1/y

y=15

x=15

f)

(x+1)/3=(2x-1)4

4(x+1)=3(2x-1)

4x+4=6x-3

6x-4x=4+3

2x=7

x=7/2

x=3,5

Answer 2

a)

x/2=5/3

3x=2*5

3x=10

x=10/3

b)

3/2=x/4

4*3=2x

12=2x

6=x

c)

3/12=(x-1)/(x-1+12)

3/12=(x-1)/(x+11)

3*(x+11)=(x-1)*12

3x+33=12x-12

3x-12x=-12-33

-9x=-45

x=-45/-9

x=5

d)

x/y=3/5

5x=3y

5x/3=y

Agora substituímos na equação que o exercício deu:

x+y=16

x+5x/3=16

3x/3+5x/3=16

8x/3=16

8x=16*3

8x=48

x=48/8

x=6

e)

(2x/3)/x=10/y

(2x/3)*y=10x

2xy=10x*3

2xy=30x

y=30x/2x

y=15

f)

(x+1)/(2x-1)=3/4

(x+1)*4=3*(2x-1)

4x+4=6x-3

4x-6x=-3-4

-2x=-7

x=-7/-2

x=+7/2