Объяснение:
-(х²+10х+27)= -(х²+10х+25+2)= -((х+5)²+2)= -(х+5)²-2<0
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Объяснение:
-(х²+10х+27)= -(х²+10х+25+2)= -((х+5)²+2)= -(х+5)²-2<0