December 2021 0 11 Report
Зная соотношение элементов в соединений и составьте его формулу а)фосфор:кислород=2:5
b)фосфор:водород=1:3
c)железо:кислород=2:3
d)железо:кислород=1:1
ПЖ ОЧЕНЬ НАДО!!!
ДАМ 65БАЛЛОВ.
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