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f=2,5m
y=0,4m
Szukane;
x=?
wzór;
1/x+1/y=1/f
1/x+1/0,4=1/2,5
1/x=1/2,5-1/0,4
1/x=10/25-1/4
1/x=10/25-5/25
1/x=5/25
25=5x / 5
x=4m