m(甲)/m(乙)=a/b (1)m(乙)/m(碳-12 )=c/d (2)可以算出m(乙)=c/d*m(碳-12 ) 代入(1)得出m(甲)/m(碳-12 )=ac/bd则甲原子的相对原子质量m(甲)/(1/12)*m(碳-12 )=12ac/bd
12ac/bd