已知x/y+y/x=2,求x²+xy+y²/x²-4xy+y²的值 已知x/y+y/x=2,求x²+xy+y²/x²-4xy+y²的值

已知(x+y)²;=8,(x-y)²;=4,求x²+y² 已知x²y²+x²+y²=10xy-16 求x,y 已知x/y=3,求x²+2xy-3y²/x²-2xy+y² 已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值 已知:x²-6x+8y+y²+25=0,求x²+2xy+y² 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+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 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 = 已知x²+y²-2x-4y+5=0,求分式y/x-x/y的值. 已知(x²+y²)(x²+y²-6)+9=0 ,求x²+y²的值. 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y 就是已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y /4y就是除以4y 已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值 已知,x²+2y²-2xy-4y+4=0,求x²+y²的值 已知x²-4x+4+（y+x的绝对值）=0,求x²y-x²分之2x+x²÷y²-2y+1分之x²+4x+4另外还有一题：已知x-3y=0,求x²-2xy+y²分之2x+y×（x-y)的值. 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值 已知x²-4x+y²-10y+29=0.求x²y²+2x³y²+[x²]²y²的值. 2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y