1/4 + 1/9 + 1/16 + 1/25 + 1/36 + 1/49 + 1/64 + 1/81 =
Numitor comun :
4=2^2
9=3^2
16=2^4
25=5^2
36=2^2•3^2
49=7^2
64=2^6
81=3^4
__________
cmmmc = 2^6•3^4•5^2•7^2=6 350 400
(1 587 600+705 600+396 900+254 016+176 400+129 600+99 225+78 400)/6 350 400 =
3 427 741/6 350 400 = aprox.0,54
0,4 < 0,54 < 0,888... Adevărat
