-x^2-10x+9因式分解,
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-x^2-10x+9因式分解,
-x^2-10x+9因式分解,
-x^2-10x+9因式分解,
=-(x^2+10x)+9
=-(x+5)^2+25+9
=-(x+5)^2+34
-x^2-10x+9因式分解,
-x^2-10x+9因式分解,
-x^2-10x+9因式分解,
=-(x^2+10x)+9
=-(x+5)^2+25+9
=-(x+5)^2+34