el promedio armónico de 10; 12; 20 y a es 15, hallar a
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el promedio armónico de 10; 12; 20 y a es 15, hallar a
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4/(1/10+1/12+1/20+1/a)=15
1/10+1/12+1/20+1/a=4/15
7/30+1/a=4/15
1/a=4/15-7/30
1/a=1/30
a=30