y=2x²+3x y=-x²-2x y=2x²-6x+3 y=2x²+3x y=2x²-6x+3用顶点式解出他们,

y=2x²+3x y=-x²-2x y=2x²-6x+3 y=2x²+3x y=2x²-6x+3用顶点式解出他们,
y=2x²+3x y=-x²-2x y=2x²-6x+3 y=2x²+3x y=2x²-6x+3
用顶点式解出他们,

y=2x²+3x y=-x²-2x y=2x²-6x+3 y=2x²+3x y=2x²-6x+3用顶点式解出他们,
y=2x²+3x=2(x²+3/2x+9/16)-9/8=2(x+3/4)²-9/8
y=2(x+3/4)²-9/8
y=-x²-2x=-(x²+2x+1)+1=-(x+1)²+1
y=-(x+1)²+1
y=2x²-6x+3=2(x²-3x+9/4)-9/2=2(x-3/2)²-9/2
y=2(x-3/2)²-9/2