1. y=4x2-4x+5
2. y=7x2-49x+1
3. y=-3x2-9x-1
4. y=-5x2+10x-2
5. y=-6x2+3x+1
2为平方
1. y=4x2-4x+5
2. y=7x2-49x+1
3. y=-3x2-9x-1
4. y=-5x2+10x-2
5. y=-6x2+3x+1
2为平方
1. y=4x2-4x+5=(4x^2-4x+1)+4=(2x-1)^2+4
2. y=7x2-49x+1=7(x^2-7x+49/4)-339/4=7(x-7/2)^-339/4
3. y=-3x2-9x-1=-3(x^2+3x+9/4)+23/4=-3(x-3/2)^2+23/4
4. y=-5x2+10x-2=-5(x^2-2x+1)+3=-5(x-1)^2+3
5. y=-6x2+3x+1=-6(x^2-x/2+1/16)+11/8=-6(x-1/4)^2+11/8
1、y=4(x-1/2)^2+4
2、y=7(x-7/2)^2-339/4
3、y=-3(x+3/2)^2+23/4
4、y=-5(x-1)^2+3
5、y=-6(x-1/4)^2+11/8