-Ta tinh dc trong M2X3: 
Zt Nt />=>2Z(M)+3Z(X)=76 (1) 
2N(M)+3N(X)=84 (2) 
cong 1,2=>2A(M)+3A(X)=160 (3) 
lai co: A(M)-A(X)=40 (4) 
giai 3,4=> A(M)=56, A(X)=16 (5) 
(tuy o day ta co the biet M,X nhung ta phai tinh Z de suy ra nguyen to) 
-tong hat M>tong hat X la 53+3+2=58 
=>Z(M)+A(M)-Z(X)-A(X)=58 (6) 
5,6 =>Z(M)-Z(X)=18 (7) 
1,7=>Z(M)=26, Z(X)=8=> Fe2O3