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20см O P(50см) F(80см)
PL1=FL2
mg(50-30)=F80
8*10*20=F80
80*20=F80
F=20 H
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====Δ======⇵==========⇅
20см O P(50см) F(80см)
PL1=FL2
mg(50-30)=F80
8*10*20=F80
80*20=F80
F=20 H