已知x+y=√(2),则1/2x^2+xy+1/2y^2=

发布于2022-02-19 18:45:33
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网友回答2022-02-19
1/2x^2+xy+1/2y^2 =1/2(x^2+2xy+y^2) =1/2(x+y)^2 =1/2*(√2)^2 =1/2*2 =1

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