Question

Determine a medida de AB em cada caso:

Answer 1

A)
2/3= 4/(x+3)
2.(x+3)=3.4 (:2)
X+3= 3.2
X+3=6
X=3
AB=3+3=6 cm

_________
B)
2/x= 5/2
2.2= 5x
4 = 5x
5x=4
x=4/5
X=0,8
AB=0,8 cm
__________

C) em função de @:

10/(4+x) = 4/10 (:2)/(:2)
10/(4+x)= 2/5
10.5= 2.(4+x) (:2)
5.5= 4+x
25=4+x
25-4=x
X =21
AB=21 cm