Ответ:5H
Объяснение:F1/F2 = l2/l1
F2=F1*l1/l2
20H*10/40 =5H
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Ответ:5H
Объяснение:F1/F2 = l2/l1
F2=F1*l1/l2
20H*10/40 =5H