(ax+by)^2+(ay-bx)^2+2(ax+by)(ay-by)

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(ax+by)^2+(ay-bx)^2+2(ax+by)(ay-by)(ax+by)^2+(ay-bx)^2+2(ax+by)(ay-by)(ax+by)^2+(ay-bx)^2+2(ax+by)(a

(ax+by)^2+(ay-bx)^2+2(ax+by)(ay-by)
(ax+by)^2+(ay-bx)^2+2(ax+by)(ay-by)

(ax+by)^2+(ay-bx)^2+2(ax+by)(ay-by)
原式正好是一个完全平方式(ax+by)^2+(ay-bx)^2+2(ax+by)(ay-bx)=(ax+by+ay-bx)²

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