因式分解x^3+3x^2y+2xy^2

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因式分解x^3+3x^2y+2xy^2
因式分解x^3+3x^2y+2xy^2

因式分解x^3+3x^2y+2xy^2
原式=(x^3+x²y)+(2x²y+2xy²)[将3x²y拆成两项]
=x²(x+y)+2xy(x+y)
=(x+y)(x²+2xy)
=x(x+y)(x+2y)


x^4-3x^3+x^2y+2x^2-2xy=(x^4-3x^3+2x^2)+(x^2y-2xy)
=x^2(x-1)(x-2)+xy(x-2)
=x(x-2)(x^2-x+y)