因式分解-x^2+10x-21
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因式分解-x^2+10x-21
因式分解-x^2+10x-21
因式分解-x^2+10x-21
-x^2+10x-21
=-(x-3)(x-7)
=-(x²-10x+21)
=-(x-7)(x-3)
-(x-3)(x-7)
因式分解-x^2+10x-21
因式分解-x^2+10x-21
因式分解-x^2+10x-21
-x^2+10x-21
=-(x-3)(x-7)
=-(x²-10x+21)
=-(x-7)(x-3)
-(x-3)(x-7)