①、y=x²-2x②、y=2x+3③、y=根号2x+1④、y=x-1分之x⑤、y=根号x-1分之1⑥、y=三次根号x+1⑦、y=根号x+1+根号2-x

x²-4y² x+2y---------- ÷ --------分数线x²+2xy+y² x²+xyx²-4y² x+2y----------÷--------分数线x²+2xy+y² x²+xy(x+2y)(x-2y)x(x+y)=----------------(x+y)(x+y)(x+2y)(x-y)x=------(x+y)这样对了吗? 2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y 若x²+xy-2y²=0,则x²+3xy+y²/x²+y² x²+xy-2y²=0则x²+3xy+y²/x²+y² x²-y²=1｛(x-y)²-2(x-y-2)=7 化简再求值[(x²+y²）²-4x²y²]÷(x²-y²）其实,x=2,y=2/3. 已知X+Y=7①XY=2②求2X²+2Y²；2（X²-Y²)的解! 已知x-2y=3,x²-2xy+4y²=11,求①xy ②x²y-2xy² 因式分解2x(x-y)四次方-x²(x-y)²=xy(y-x)² 怎么算啊这个：X²+4X+Y²-2Y+5=0 则X²+Y²=?²²²²²²²²²²²²X²+4X+Y²-2Y+5X=0 则X²+Y²=? 4m²（2x-3y)²-m²（3x-2y)²=? 已知x²+y²-6x+4y+13=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)²已知x²+y²-6x+4y+13=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)² x²+y²+1.25=2x+y 求X与Y X²-Y²=2XY,求(X-Y)÷(X+Y) ( x²+y²-10x-10y=0 ,x²+y²-6x+2y-40=0 )求出x,y 已知2x+3y=0,求代数式1.5x+4y/3x-2y 2.x²+xy-y²/x²-xy+y² 已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/xy的值 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² =