y=2x²-5x+1 化为顶点式
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y=2x²-5x+1 化为顶点式
y=2x²-5x+1 化为顶点式
y=2x²-5x+1 化为顶点式
y=2x²-5x+1
=2(x^2-5/2x)+1
=2(x^2-5/2x+25/16)-2*25/16+1
=2(x-5/4x)^2-17/8
y=2(x²-5/2x+1/2)
y=2(x²-2x5/4x+1/2)
y=2[x²-2x5/4x+(5/4)²-(5/4)²+1/2]
y=2[(x-5/4)²-25/16+8/16]
y=2[(x-5/4)²-17/16]
y=2(x-5/4)²-17/8