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1/12 + 1/s' = 1/4
1/s' = 1/4 - 1/12
1/s' = 3/12 - 1/12
1/s' = 2/12
2s' = 12
s' = 12:2
s' = 6 cm
M = | s'/s |
M = | 6/12 |
M = 1/2 = 0,5 kali
Jawaban: B