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1/4= 1/si + 1/12
1/4 - 1/12 = 1/si
(samakan penyebutnya)
3/12 - 1/12 = 1/si
2/12 = 1/si (lalu perkalian silang)
12x1 = 2si
12 = 2si
12/2 = si
6 = si
perbesaran bayangan
rumusnya : M = si/so
si/so
6/12 = 1/2 kali