配方法解y²-6y-6=0-搜答案-神马作文网

y^2-4√3y+(2√3)^2=-12+(2√3)^(y-2√3)^2=-12+12(y-2√3)^2=0y-2√3=0y1=y2=2√3

1.-2y^2/3+y/3+2=0=>2y^2-y-6=0=>2(y-1/4)^2=6+1/8=49/8=>(y-1/4)^2=49/16=>y-1/4=±7/4=>y=1/4±7/4=>y=2或-3

y=5x方+6x 配方法

y=5(x²+6x/5)=5(x²+6x/5+9/25-9/25)=5(x²+6x/5+9/25)-9/5=5(x+3/5)²-9/5再问：你写错了吧，最后不应

再答：望您采纳！

-y²+2y+3=0y²-2y-3=0(y-1）²-1-3=0(y-1)²=4y-1=±2y=3或y=-1

3x²-12x+4y²-8y+16=03(x²-4x)+4(y²-2y)+16=03(x²-4x+4-4)+4(y²-2y+1-1)+16=

-y²-2y+3=0y²+2y-3=0y²+2y=3y²+2y+1=3+1(y+1)²=4y+1=±2y=-1±2y1=-1+2=1y2=-1-2=-

2x^2+7x+6=0得（2x+3）（x+2）=0x=-2或x=-1.5后面的话我还真看不懂那是什么怎么有两个等号3y^2-2y=2y+3(x+4)(x+5)=5?

-y^2+2y+3=0y^2-2y＝3y^2-2y+1＝3+1（y-1）^2=4y-1=2y=3或y-1=-2y=-1再问：那个负号怎么变的？再答：-y^2+2y+3=0y^2-2y-3=0

（1-y）（3y-2）=y（y-3）3y-2-3y²+2y=y²-3y-4y²+8y=2y²-2y=-1/2y²-2y+1=1/2(y-1)²

y=2(x²-4x+4-4)-6=2(x-2)²-14顶点（2,-14）对称轴x=2

6y²-y-12=0y²-y/6-2=0y²-y/6+(1/12)²=2+1/144(y-1/12)²=289/144y-1/12=±17/12y=1

1、y=2x²-6x由题,y=2（x²-3x）=2[x²-3x+（3/2）^2-（3/2）^2]=2(x-3/2)^2-2*9/4=2(x-3/2)^2-9/2所以：y=

y²-6y+10=(y-3)^2+1≥1∴y²-6y+10的值大于0❤您的问题已经被解答~(>^ω^

配方法的解题步骤是：（1）常数项右移；（2）除以二次项系数；（3）配方：都加一次项系数一半的平方；（4）直接开平方求解.以最麻烦的题目为例：2x²+4x=3x²+2x=3/2x&#

x²-6x+9+y²+10y+25=0(x-3)²+(y+5)²=0∴x-3=0y+5=0∴x=3y=-5

3y²-y-2=0y²-y/3-2/3=0(y-1/6)²-1/36-2/3=0(y-1/6)²=25/36y-1/6=±5/6y1=1y2=-2/3

y(y-3)=2y-7y^2-3y-2y+7=0y^2-5y+7=0(y-5/2)^2-25/4+7=0(y-5/2)^2+3/4=0(y-5/2)^2=-3/4此题在实数范围内无解