Г=4=f/d f=4*d=120 см 1/d+1/f=1/F f=d*f/(f+d)=30*120/(30+120)=24 см
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Г=4=f/d f=4*d=120 см 1/d+1/f=1/F f=d*f/(f+d)=30*120/(30+120)=24 см