消元法几道题若X-1=(Y+1)/2=(Z-2)/3,求X^2+Y^2+Z^2可取得的最小值求抛物线Y=X^2-2MX+2M^2-3M+1顶点的纵坐标Y与横坐标X之间的关系在三角形ABC内部或边界上任取一点P,记P到三边a,b,c的距离依次为X,Y,Z.求证a
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