x,y,z为有理数,xyz不等求证:√(1/〖(x-y)〗^2 +1/〖(y-z)〗^2 )也是有理数
x,y,z为有理数,xyz不等求证:√(1/〖(x-y)〗^2 +1/〖(y-z)〗^2 +1/〖(z-x)〗^2 )也
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