Дано:
f/d=5
F-?
----------
1/F=1/d+1/f
1/F=1/d+1/5*d
1/F=6/5*d
F=5*1,8/6=1,5 м
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Дано:
f/d=5
F-?
----------
1/F=1/d+1/f
1/F=1/d+1/5*d
1/F=6/5*d
F=5*1,8/6=1,5 м