Question

Nas figuras, a // b // c, calcule o valor de x

Answer 1

pelo teorema de Tales

a) x-5/x+1=6/24

x-5/x+1=1/4
x+1=4(x-5)
x+1=4x-20
3x=21
x=7
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b) 8/x+1=12/2x-6

12(x+1)=8(2x-6)
12x+12=16x-48
4x=60
x=15
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c) 5+3/5=12/x
8/5=12/x
8x=60
x=60/8
x=15/2
x=7,5
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