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zn 64 30 zn 66 30 zn 67 30 zn 68 30

Răspuns :

in principiu, se rezolva asa,daca exista 5 izotopi

M,mediu= c1/100xM1 + c2/100xM2 + c3/100xM3 + c4/100xM4 + c5/100xM5