Question

Nas proporções a seguir, calcule o valor de x:
a) 2/3x=5/30
b) x-2/5=2+x/7
c) 2/15=3/2x
d) x+5/x=10/8

ALGUEM ME AJUDA!

Answer 1

Resposta:

Explicação passo-a-passo:

a) 2/3x=5/30(:5)(:5)

2x/3= 1/6

2x = 3.1/6

2X = 3/6 (:3)/(:3)

2x = 1/2

2.2x= 1

4x = 1

X = 1/4

b) x - 2/5=2+x/7

X - x/7 = 2+2/5

(7x - x)/7 = (5.2+2)/5

6x/7= 12/5

5.6x = 12.7

30x = 84 (:2)

15x = 42 (:3)

5x = 14

X = 14/5

c) 2/15=3/2x

2/15 = 3x/2

2.2 = 15.3x

4 = 45x

45x = 4

X = 4/45

d) x+5/x=10/8 (:2)/(:2)

(X+5)/x = 5/4

4.(x+5)= 5x

4x +20= 5x

20 = 5x - 4x

20 = x

x = 20