Method 2 orthogonal transformation type is a standard quadratic

first question

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The second question

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Theoretical support

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--- Last two figures from Yu-brother "line represents 9 talk" and "closed-door practice"

---- Data from Tencent video "Chengdu University of Electronic Science and Technology Institute Mooc series of video tutorials"

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Origin www.cnblogs.com/LinQingYang/p/11692496.html