若x=3+1
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若x=
+1
3 |
![若x=3+1](/uploads/image/z/7816095-63-5.jpg?t=%E8%8B%A5x%3D3%2B1)
由x=
3+1得3=(x-1)2,
∴y=2x5-4x4-x3-6x2-6
=2x3(x2-2x+1)-2x3-x3-6x2-6
=2x3(x-1)2-3x3-6x2-6
=2x3×3-3x3-6x2-6
=3x3-6x2-6
=3x(x2-2x)-6
=3x(x2-2x+1)-3x-6
=3x(x-1)2-3x-6
=3x•3-3x-6
=9x-3x-6
=6x-6
=6(x-1)
=6
3.
3+1得3=(x-1)2,
∴y=2x5-4x4-x3-6x2-6
=2x3(x2-2x+1)-2x3-x3-6x2-6
=2x3(x-1)2-3x3-6x2-6
=2x3×3-3x3-6x2-6
=3x3-6x2-6
=3x(x2-2x)-6
=3x(x2-2x+1)-3x-6
=3x(x-1)2-3x-6
=3x•3-3x-6
=9x-3x-6
=6x-6
=6(x-1)
=6
3.
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