首先得yz=x^2-8x+7,然后得y^2+z^2=-x^2+14x-13.注意y^2+z^2≥2yz≥-(y^2+z^2),因此解得1≤x≤9
设三实数x,y,z满足等式x^2-yz-8x+7=0及y^2+z^2+yz-6x+6=0,则x的范围是?
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