x^2-xy-2y^2-x-y=?.
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/28 20:30:47
x^2-xy-2y^2-x-y=?.
x^2-xy-2y^2-x-y=?
.
x^2-xy-2y^2-x-y=?.
x²-xy-2y²-x-y
=(x²-y²)-(xy+y²)-(x+y)
=(x-y)(x+y)-y(x+y)-(x+y)
=(x-y-y-1)(x+y)-(x+y)---------------------------提取公因式(x+y)
=(x-2y-1)(x+y)
x^2-xy-2y^2-x-y=x^2-xy-2y^2-(x+y)=(x-2y)(x+y)-(x+y)=(x-2y-1)(x+y)
f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y
(-x-y)(x^2+xy+y^2)
化简x^-y^/x^-2xy+y^
2*(x-y)²(y-x)(xy)
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?
(x^2+xy/x-y)/(xy/x-y)计算
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
(-x+2y)(2x+y)-(2x+y)(y-2x)-3xy=?因式分解
f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)!
x+y=-3 xy+x+y=-2 x/y+y/x=?
正数x,y满足x-y=2xy,求x-y/x+y的值.
f(x+y,x-y)=2xy(x-y),求f(x,y)
x^2+xy+x=36,y^2+xy+y=20,求x+y.
若x^2+xy+y=14,y^2+xy+x=28,求x+y
函数f(xy,x+y)=x^2+xy+y^2,则df(x,y)=?
f(xy,x-y)=x^2+3xy+y^2,则f(x,y)=?
X-Y/2X+2Y XY/X+Y²
因式分解:x×x-xy-2y×y-x-y