Question

Determine o valor do X nas proporções:

A)15/4=30/x

B)3/5=x/10

C)1/x=3/9

D)x/15=1/5

E)x/9=1/5

F)y/2=15/10

G)5/y=3/6

H)7/8=14/a

I)1/9=xZ/15

J)11o/m=1/3

K)1/7=x/8

L)11/5=x/10

M)45/9=15/x

N)Z/100=216/600

Answer 1

Olá.
Basta você multiplicar em cruz.
a) 15/4 = 30/x
15x=120
x=120/15 ÷ 15
x = 8

b) 3/5= x/10
5x=30
x = 30/5 ÷ 5
x=6

c) 1/x=3/9
3x=9
x=9/3 ÷ 3
x=3

d) x/15=1/5
5x=15
x=15/5 ÷ 5
x=3

e)x/9=1/5
5x=9
x= 9/5

f)y/2=15/10
10y=30
y=30/10 ÷ 10
y=3

g) 5/y=3/6=
3y=30
y=30/3 ÷ 3
y = 10

h)7/8=14/a
7a=112
a = 112/7 ÷ 7
a= 16
i) 1/9=xz/15
9xz = 15
xz=15/9 ÷ 3
xz = 5/3

j) 110/m =1/3
m=330

k) 1/7=x/10
7x=8
x=8/7

l) 11/5=x/10
5x=110
x=110/5 ÷
x=22

m) 45/9=15x
45x=135
x=135/45
x=3

n) z/100=216/600
600z=21600
z=21600/600 ÷ 60
z = 36

Espero ter ajudado