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2014-02-25T19:17:50+02:00
5X-2-7X-1=5X-2-7X-1=-2X-3
multumesc
A;5X-2=0 unde 5x=2,si x=2/5 B;7x+1=0 unde 7x=-1,si x=1/7 A-B=2/5-1/7 UNDE SE AMPLIFICA FRACTIILE CU;7 SI 5 SI AVEM ASA 14/35-5/35=9/35. DECI A-B=9/35