x^3-2x^2-x+2>0化为(x-2)(x-1)(x+1)>0怎么转?
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x^3-2x^2-x+2>0化为(x-2)(x-1)(x+1)>0怎么转?
x^3-2x^2-x+2>0化为(x-2)(x-1)(x+1)>0怎么转?
x^3-2x^2-x+2>0化为(x-2)(x-1)(x+1)>0怎么转?
原式=X^2(X-2)-(X-2)
=(X-2)(X^2-1^2)
=(X-2)(X+2)(X-2)
很简单