y=-2x²-3x+1配方
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y=-2x²-3x+1配方y=-2x²-3x+1配方y=-2x²-3x+1配方y=-2x²-3x+1=-2(x²-3x/2)+1=-2[x²
y=-2x²-3x+1配方
y=-2x²-3x+1配方
y=-2x²-3x+1配方
y=-2x²-3x+1
=-2(x²-3x/2)+1
=-2[x²-3x/2+(3/4)²]+2×(3/4)²+1
=-2(x-3/4)²+17/8
y=-2x²-3x+1
=-2（x²+3x/2-1/2)
=-2[x²+2*3/4*x+(3/4)²-(3/4)²-1/2]
=-2[(x+3/4)²-17/16]
=-2(x+3/4)²+17/8