Question

Kerjakan 1&2 pakai cara. yg warna gelap soalnya

Answer 1

1.) a/a+9 = 6/18
     a/a+9 = 1/3  (disederhanain)
     a+9 x 1 = 3 x a
     a+ 9 = 3a
    9 = 3a - a
     9 = 2a
     a = 4,5  cm .. (B)

2)  CA misal --> 4+x
     CE misal --> y

cari CA dulu ..
 4/4+x = 6/9
 4/4+x = 2/3 (sederhanain)
 4 x 3 = (4+x) x 2
 12 = 8 + 2x
 12-8 = 2x
 4 = 2x
 x = 2 cm .. 
 kemudian CA = 4 + x = 4 + 2 = 6 cm ,,

cari CE kemudian ..
y/y+3 = 6/9
y/y+3 = 2/3 (sederhanain)
y x 3 = 2 x (y+3)
3y = 2y + 6
y = 6 cm ,,,

jadi jawabannya adlh B ..