(ax+by)^2+(bx-ay)^2(x-y)^2+4(x-y+1)在实数范围内分解:-2m^2+10m^4-6m^2+9

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(ax+by)^2+(bx-ay)^2(x-y)^2+4(x-y+1)在实数范围内分解:-2m^2+10m^4-6m^2+9
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(ax+by)^2+(bx-ay)^2(x-y)^2+4(x-y+1)在实数范围内分解:-2m^2+10m^4-6m^2+9
(ax+by)^2+(bx-ay)^2
(x-y)^2+4(x-y+1)
在实数范围内分解:
-2m^2+10
m^4-6m^2+9

(ax+by)^2+(bx-ay)^2(x-y)^2+4(x-y+1)在实数范围内分解:-2m^2+10m^4-6m^2+9
(ax+by)^2+(bx-ay)^2
=a^2x^2+b^2y^2+2abxy+b^2x^2+a^2y^2-2abxy
=a^2x^2+a^2y^2+b^2y^2+b^2x^2
=a^2(x^2+y^2)+b^2(x^2+y^2)
=(a^2+b^2)(x^2+y^2)
(x-y)^2+4(x-y+1)
=(x-y)^2+4(x-y)+4
[完全平方公式]
=(x-y+2)^2
-2m^2+10
=-2(m^2-5)
=-2(m-√5)(m+√5)
m^4-6m^2+9
=(m^2-3)^2
=[(m-√3)(m+√3)]^2
=(m-√3)^2*(m+√3)^2