расставьте коэффициены 1) Cu+02--CuO; 2) Al+S-AL Sz;
3) Pt04 →Pt+O2;
4) KBr+C12-KCI+Bra; 5) Fe2O3+C-C0+Fe;
6) Mg(NO3)2+ NaOH -NaNO3+Mg(OH)2​
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