已知x+y=7,xy=-8,求xx+yy
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已知x+y=7,xy=-8,求xx+yy
已知x+y=7,xy=-8,求xx+yy
已知x+y=7,xy=-8,求xx+yy
建立方程组
解析
∵x+y=7
xy=-8
xx+yy=(x+y)(x+y)-2xy
=7x7-2*-8
=49+16
=65
65
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