15/10=y/18=x/10 3/2=y/18,vc multiplicar cruzado Y×2=3×18 3/2=x/10 2y=54 2×x=10×3 Y=54/2 2x=30 Y=27 ,valor de y x=30/2 X=15 15,valor de x
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CB = 10 + X
EB = X
CA = 15
ED = 10
CB CA
----- = ------
EB ED
10+x 15
------------ = -------
x 10 só cruzar
15(x) = 10(10+x)
15x = 100 + 10x
15x - 10x = 100
5x = 100
x = 100/5
x = 20
para achar o (y)
AB= Y + 18
DB = 18
CA = 15
ED = 10
AB CA
-------- = ---------
DB ED
y+18 15
-------- = --------
18 10 só cruzar
10(y+18) = 18(15)
10y +180 = 270
10y = 270 - 180
10Y = 90
y = 90/10
y = 9
b)
para achar o (y)
BC = Y
AC = 9 + 15
MN = 6
AN = 9
BC MN
------ = -------
AC AN
Y 6
------ = -------
9 + 15 9 só cruzar
9(y) = 6(9 + 15)
9y = 54 + 90
9y = 144
y = 144/9
y = 16
achar o (x)
AB = X +9
BC = y = 16
AM = x
MN = 6
AB AM
------- = --------
BC MN
x + 9 x
--------- = -----
16 6 só cruzar
16(x) = 6(x+9)
16x = 6x + 54
16x - 6x = 54
10x = 54
x = 54/10 divide por 2
x = 27/5
15/10=y/18=x/10 3/2=y/18,vc multiplicar cruzado Y×2=3×18 3/2=x/10 2y=54 2×x=10×3 Y=54/2 2x=30 Y=27 ,valor de y x=30/2 X=15 15,valor de x