问题
选择题
若实数x、y、z满足（x-z）2-4（x-y）（y-z）=0，则下列式子一定成立的是 [ ]
A.x+y+z=0
B.x+y-2z=0
C.y+z-2x=0
D.z+x=2y=0
答案
答案：D
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若实数x、y、z满足（x-z）2-4（x-y）（y-z）=0，则下列式子一定成立的是 [ ]
A.x+y+z=0
B.x+y-2z=0
C.y+z-2x=0
D.z+x=2y=0
答案：D
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