-5x²+5x+6=0
Д= b²-4ac
Д= 25-4×25+6=-69
D=b²-4ac=25+120=145=√145
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-5x²+5x+6=0
Д= b²-4ac
Д= 25-4×25+6=-69
D=b²-4ac=25+120=145=√145