H (сверху)+1
H2 .. +2
O ..-2
O3.. -6
C =6-2=4
C=+4
H2CO3 ...2++4-6=0
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H (сверху)+1
H2 .. +2
O ..-2
O3.. -6
C =6-2=4
C=+4
H2CO3 ...2++4-6=0