y^2+y-20x^2-x-6(x+2)(x-4)-7
2个回答
y^2+y-20=(x+5)(x-4)
x^2-x-6=(x-3)(x+2)
(x+2)(x-4)-7=x^2-2x-8-7=x^2-2x-15=(x-5)(x+3)
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