December 2018 1 151 Report
Kakek memakai kacamata 2 dioptri untuk melihat dg jelas pd jarak baca 25 cm. Suatu hari ia meminjam kacamata temannya, tetapi ia hanya membaca dg jelas pada jarak 40 cm. Berapa kekuatan lensa kacamata temannya?
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