к реакциям замещения относятся реакции 1)Li2O+H2O=2LiOH; 2)Mg+H2O=MqO+H2; 3)2K+2H2O=2KON+H2; 4)SO3+H2O=H2SO4 во второй реакции 2) над знаком = t
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