х²-10х+10=х²-2*х*5+5²-5²+10=(х-5)²-25+10=(х-5)²-15
2) =авс-а²+авс-в²+авс-с²=-(а²+в²+с²)+3авс=-1*0+3авс=0+3авс=3авс
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х²-10х+10=х²-2*х*5+5²-5²+10=(х-5)²-25+10=(х-5)²-15
2) =авс-а²+авс-в²+авс-с²=-(а²+в²+с²)+3авс=-1*0+3авс=0+3авс=3авс