设二次型f(x1,x2)=x12+4x1x2+4x22经正交变换化为二次型，求ab的值。 [img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606154749_14092.png" alt="" />
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正确答案： [img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606154959_54965.png" alt="" /> [img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606154959_95311.png" alt="" /> 答案分析：无
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