Ответ:
1/F=1/d+1/f
1/20=1/15+1/f
1/f=1/20-1/15
1/f=-1/60
F=-60
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Ответ:
1/F=1/d+1/f
1/20=1/15+1/f
1/f=1/20-1/15
1/f=-1/60
F=-60