Question

calcule o valor de x nas proporções:

a) x-2/12 = x/20
b) x+1/5 = x/3
c) x/6 = x-2/10
d) x-1/7 = 2/12
e) x+3/x-2 = 3/2
f) 2/1 = 15-x/x
g) 20/x+1 = x+3/x-1
h) 3/2 = x+3/x-1

Answer 1

Resposta:

B) x-1/5=x/3

3 (x-1)=5x

3x-3=5x

3x-5x=3

-2x=3

x=-3/2

C) x/6=x+2

x=6x+12

x-6x=12

-5x=12 (-1)

x=-12/5

D) x-1/7=16/28 ÷4

x-1/7=4/7

x-1=4

x=5

E)x-2/x-2=3/2

x-2/x-2=3/2

1=3/2

XEO

F) 2=15-x/2

2×2=15-x/2

4=15-x

x=15-4

x=11

G)20/x-1=16/x

20x=16 (x-1)

20x=16x-16

20x-16x=-16

4x=-16

x=-16/4

x=-4

H)3/2=x+3/x-1

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

3x-3=2x+6

3x-2x=6+3

x=9

BONS ESTUDOS ^^'

Explicação passo-a-passo: