Ответ:
F1/F2 =S1/S2
F1/F2 = 400/2.5
F1/F2 = 160
в 160 раз
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Ответ:
F1/F2 =S1/S2
F1/F2 = 400/2.5
F1/F2 = 160
в 160 раз