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7:6
56/7 : 16/3
0,125:0,1875
1:1,5
10:15 /:5
2:3
Fe2O3
amfoteryczny
mFe*x/mO*y=7/3
56x/16y=7/3
56x*3=16y*7
168x=112y
x : y=2 : 3
Fe2O3
charakter amfoteryczny