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1/s' = 1/25 - 1/100
1/s' = 4/100 - 1/100
1/s' = 3/100
s' = 33,3 cm
jd jwbnya B
s = 100 cm
f = 25 cm
dit: s' ?
jb: 1/f = 1/s + 1/s'
1/s' = 1/f - 1/s
1/s' = 1/25 - 1/100
1/s' = 4/100 - 1/100
1/s' = 3/100
s' = 100/3
s' = 33,3 cm