Urrgeennnccce pour demain !!!
a, b et c sont dens nombres tels que : 0 1) demontrer que (ca-1)(bc-1)(ab-1)<0
2)deduire -de la 1ere question - que :
a+b+c+1/abc > 1/a+1/b+1/c+abc

Aidez svp c est pour demainnn
Et merci davance
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