A{(x,y)|1-x²分之y=1},B={(x,y)|y=1-x²},若C{(x,y)|(x,y)
已知集合A={(x,y)|ax+y=1},B={(x,y)}|x+ay=1},C={(x,y)|x²+y&su
已知x+y=1,xy=-2分之1,利用因式分解求:x(x+y)(x-y)-x(x+y)²的值
1、若|x-1|+(y+3)²=0,则x²+y²=
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b
(x+y)²-4(x+y-1)
集合意义是否相同{X/y=X²+1} 与 {(x,y)/x=0}{x/y=X²+1} 与 {y/y=
分解因式 x²(x²-y²)+z²(y²-x²) (a+b)
1、x²+4y²+_______=(x-2y)²
1.已知x/x-1=(y²+4y-1)/(y²+4y-2),则y²+4y-x的值为多少?
M={(x,y)|x²+y²≤4},N={(x,y)|(x-1)²+(y-1)²
1.若x=2,y=1,则(x-y)(x²+xy+y²)=______.
已知x,y满足x²+y²-4x-6y+13=0,求(-y/x³)³÷(-1/xy