初浩星兴0AI
2014-02-10
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t^2-8t+12
=(t^2 - 2t)-(6t-12)
=t(t-2)-6(t-2)
=(t-6)(t-2)
2. x^2+7x-18
=(x^2- 2x)+(9x-18)
=x(x-2)+9(x-2)
=(x+9)(x-2)
3. x^2-2xy-3y^
=x^2 -2xy + y^2 -4y^
=(x-y)^2-(2y)^2
=(x-y-2y)(x-y+2y)
=(x-3y)(x+y)
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