y=x^2+4x+1 y=-3x^2+6x y=-(1/3)x^2-2x+1 y=-(x+3)^2+5 的顶点坐标是多少

y=x^2+4x+1 y=-3x^2+6x y=-(1/3)x^2-2x+1 y=-(x+3)^2+5 的顶点坐标是多少 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 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 设动点P与P'的坐标为（X,Y）（X',Y'）它们满足X'=3X+2Y+1,Y'=X+4Y-3. 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 当x=1,y=-2时,代数式x-(x+y)+(x+2y)-(x+3y)+...-(x+99y)的值是多少 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 (3x-y)^2+(3x+y)(3x-y),x=1,y=-2 若x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)