y=3x^2-2x+1
=3(x^2-2/3x+1/9)+2/3
=3(x-1/3)^2+2/3
图像是【抛物线】,顶点是_（1/3,2/3)________,对称轴是__x=1/3_______,它与y轴的交点是______(0,1)______.