因式分解 y^3-4y+4y^2

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因式分解 y^3-4y+4y^2
因式分解 y^3-4y+4y^2

因式分解 y^3-4y+4y^2
y^3-4y+4y^2
=y(y²+4y+4-8)
=y[(y+2)²-8]
=y(y+2+2√2)(y+2-2√2)

提出y

y(y-2)^2

y(y+2+2根号2)(y+2-2根号2)
y^3-4y+4y^2
=y(y²+4y+4-8)
=y[(y+2)²-8]
=y(y+2+2√2)(y+2-2√2)

=y(y²-4+4y)
=y(y²+4y-4)
=y[(y²+4y+4)-8]
=y[(y+2)²-8]
=y[y+2+2√2][y+2-2√2]

原式=y(y2+4y)-4y
=y(y+2)^2 - 8y
=y[(y+2)^2 - 8]
=y (y+2-2根号2)(y+2+2根号2)

=y(y²+4y-4)
=y[(y+2)²-8]
=y(y+2-2√2)(y+2-2√2)
√为根号