1已知实数x y满足x^2+y^2+2x-2√3y=0 求x^2+y^2的最小值x+y的最大值2已知实数x.y 满足x^2+y^2=9(y大于等于0) 求 m=y+3/x+1 和b=2x+y的取值范围
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