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calculati si explicati fractiile;1/12+1/18+1/30+1/45

Răspuns :

12=2^2*3
18=3^2*2
30=2*3*5
45=3^2*5

2^2*3^2*5=180

1/12+1/18+1/30+1/45= 
(15+10+6+4)/180=35/180=7/36