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2014-01-04T22:10:25+01:00
Bonsoir
3x²-18x+15 = 180
3x²-18x-165 = 0
delta = 324+1980 = 2304
Vdelta = 48 
x ' = (18-48)/6 = -5 
x" =(18+48)/6 = 11