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KL = {(12x1/3) + (28x2/3)} : (2/3+1/3)
(4+18,67) : 1
22,67
Mungkin itu, soalnya udh agak lupa sama caranya. coba di cek lagi
(AB x KD + DC x AK) : AD = KL
(12 x 1/3 AD + 28 x 2/3 AD) : AD = KL
(12/3 AD + 56/3 AD) : AD = KL
68/3 AD : AD = KL
KL = 68/3