Question

nas figuras abaixo, a//b//c. Determine os valores x

Answer 1

a)
10/30=7/X
10x=210
x=21

b)
x/x+3=2x/38
38x=2x×(x+3)
38x=2x^2+6x
38x-6x-2x^2=0
32x-2x^2=0

▲=32^2-4 (-2)(0)
▲=1024

x'=0
x"=16

X vale 16

c)
3/6x=x/18
6x^2=54
x^2=9
x=3

d)
5/x=10/30
10x=150
x=15