Tolong Isi Dong...Pake cara....bsk dikumpulin soalnya... Pliss

1. Cd/ca = ce/cb
9/12 = 12/cb
9cb = 12*12
9cb = 144
Cb = 144/9 = 16
P = 16 - 12 = 4

2. 3/x = 6/10
30 = 6x
X= 30/6 =5

3. Y/10 = 6/10
10y = 60
Y = 60/10 =6

De/bc = ae/ac
6/10 = x/2+x
12+6x = 10x
12=10x-6x
12=4x
X=3

Maaf kalo salah