求因式分解:x^4+2x^2-x+2

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求因式分解:x^4+2x^2-x+2
求因式分解:x^4+2x^2-x+2

求因式分解:x^4+2x^2-x+2
x^4+2x^2-x+2 =(x^4+x)+(2x^2-2x+2) =x(x^3+1)+2(x^2-x+1) =x(x+1)(x^2-x+1)+2(x^2-x+1) =(x^2-x+1)[x(x+1)+2)] =(x^2-x+1)(x^2+x+2)