y=2x^2-4x-8 y=0.5x^2+2x-1
y=2x^2-4x-8 y=0.5x^2+2x-1
9y=3x-(x-1),4(x+y)-(2x+4)=8y
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
y=(x^2+x)/(x+1)
1、x(x-y)(x+y)-x(x+y)^2
[(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
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
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