如题所述
1)f(x)=1/2x²-3x+4=1/2(x-3)²-1/2
顶点坐标:(3,-1/2)
2)当y=0时,1/2x²-3x+4=0
解得:x=2,x=4
与x轴交点的坐标:(2,0);(4,0)
3)