已知实数x,y,z满足x^2+y^2+z^2=4 则(2x-y)^2+(2y-z)^2+(2z-x)^2的最大值是
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已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值
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