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2,5 = 4 - 100/PP
100/PP = 1,5
PP = 66,67cm
P = 2 1/2 D = 5/2 D
Sn = 25 cm
Dit :
PP = .............?
Penyelesaian :
P = 100/Sn - 100/PP
5/2 = 100/25 - 100/PP
100/PP = 100/25 - 5/2
100/PP = (200 - 125) / 50
100/PP = 75/50
75PP = 5000
PP = 5000/75
PP = 66,67 cm
Jadi, titik dekat penderita itu adalah 66,67 cm (Jawaban D)
Ok?