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x/3+y/4+z/5=1/3這是一個三元一次方程,解不出具體的X,Y,Z所以可以假設其中個兩個數,求第三個數所以假設y=0,z=0得到:x=1所以(xy+xz+yz)/(x^2+y^2+z^2)= 1
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