y=1/2x²-2x-1
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y=1/2x²-2x-1
怎么配方?
怎么配方?
![y=1/2x²-2x-1](/uploads/image/z/20250587-11-7.jpg?t=y%3D1%2F2x%C2%B2-2x-1)
解题思路: 本题就是利用完全平方公式将二次函数解析式变成顶点式,具体过程请看解答部分
解题过程:
![](http://img.wesiedu.com/upload/9/62/9623e3d5a45ce528fa8c8315aee69533.jpg)
解题过程:
![](http://img.wesiedu.com/upload/9/62/9623e3d5a45ce528fa8c8315aee69533.jpg)
1、x(x-y)(x+y)-x(x+y)^2
y=(x^2+x)/(x+1)
(1)(x^2/x)-y-x-y
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
已知4x=9y求(1)x+y/y (2)y-x/2x
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
函数,y=3x/(x^2+x+1) ,x
函数y=3x/(x^2+x+1) (x
x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2
2(x+y) 3x+3y=24 x+y/2x x y/2y= 1
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于