F=p(ж)gV. V=m/p(т). p(ж)=F*p(т)/(g*m)=4000*2500/30=333333.3(кг/м3)
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F=p(ж)gV. V=m/p(т). p(ж)=F*p(т)/(g*m)=4000*2500/30=333333.3(кг/м3)