设实数x,y满足方程:x^+y^-8x-6y+21=0,求:(1)2x-y的取值范围 (2)x^+y^-10x+2y+26的取值范围,设实数x,y满足方程:x^+y^-8x-6y+21=0,求:(1)2x-y的取值范围 (2)x^+y^-10x+2y+26的取值范围,
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设实数x,y满足方程:x^+y^-8x-6y+21=0,求:(1)2x-y的取值范围 (2)x^+y^-10x+2y+26的取值范围,设实数x,y满足方程:x^+y^-8x-6y+21=0,求:(1)2x-y的取值范围 (2)x^+y^-10x+2y+26的取值范围,
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