ex 5 vă rog
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![Ex 5 Vă Rog class=](https://ro-static.z-dn.net/files/d6d/2c96cb48b7e44d7e46a1054b1622c849.jpg)
Al2O3-oxid de aluminiu
Cao- oxid de calciu
Fe2O3- oxid de fier III
Zno- oxid de zinc
Cu2O-oxid de cupru
Pb304- tetraoxid de plumb
No2-dioxid de azot