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Sa se calculeze:
1/9+2/8+3/7+1+4/7+6/8+8/9


Răspuns :

1/9+2/8+3/7+1+4/7+6/8+8/9 = 
= 1/9+1/4+3/7+1+4/7+3/4+8/9 =
= (28+63+108+252+144+189+224)/252 =
= 1008/252 = 4