A(x1,根号(2x1)),B(x2,根号(2x2)), F(1/2,0)
AF =根号(( (x1-1/2)^2 + 2x1)) = x1 + 1/2
BF = x2 + 1/2
AF+BF = 1+x1+x2 = 3
x1+x2 = 2
(x1+x2)/2 = 1 为中点横坐标,即中点到y轴距离
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