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[不等式] 求一个二次式的取值范围

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realnumber Posted 2022-5-19 15:24 |Read mode

实数x,y满足$x^2+y^2=4$,则$(2x-1)^2+(y-1)^2+4xy$的取值范围.

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kuing Posted 2022-5-19 15:30

原式 = (2x+y-1)^2+1

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哦，这样就会了 Posted 2022-5-19 15:49

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