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16 supra 81 + 25 supra 36 - 27 supra 64
Ma puteti ajuta pls !


Răspuns :

16/81 + 25/36 - 27/64

Calculam c.m.m.m.c. al numitorilor:

81 = 3^4

36 = 2^2 * 3^2

64 = 2^6

c.m.m.m.c.(81,36,64) = 2^6 * 3^4 = 5184

16/81 + 25/36 - 27/64 = 16*64/5184 + 25*144/5184 - 27*81/5184 = (1024 + 3600 - 2187)/5184 = 2437/5184