(ax+by)²+(ay-bx)²

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(ax+by)²+(ay-bx)²

(ax+by)²+(ay-bx)²
(ax+by)²+(ay-bx)²

(ax+by)²+(ay-bx)²
原式=a²x²+2abxy+b²y²+a²y²-2abxy+b²x²
=(a²x²+a²y²)+(b²x²+b²y²)
=a²(x²+y²)+b²(x²+y²)
=(x²+y²)(a²+b²)

=(x^2+y^2)(a^2+b^2)

(a^2+b^2)(x^2+y^2)

(ax+by)²+(ay-bx)²
=a²x²+2abxy+b²y²+a²y²-2abxy+b²x²
=a²x²+a²y²+b²y²+b²x²
=a²(x²+y²)+b²(x²+y²)
=(x²+y²)(a²+b²)