已知x-2y=4,求5（x-2y）²-x+2y-60的值

已知x-2y=4,求5（x-2y）²-x+2y-60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的值 已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值 已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值 已知x²+4x+y²-10y+29=0 求【x+2y】÷【x²-2y²】的值 已知：x²+4x+y²-+6y+13=0,求x-2y/x²+y²的值. 已知实数x,y,满足x²+y²-2x+4y+5=0,试求x,y的值 已知x（x+1）(x+2)(x+ 1.已知x/x-1=（y²+4y-1）/（y²+4y-2）,则y²+4y-x的值为多少? 已知实数x、y满足5x²-3xy+1/2y²-2x+1/2y+1/4=0 求x、y的值 已知x,y满足x²+y²+5/4=2x+y,求代数式（x+y)·xy的值. x²-2x+y²+4y+5=0,求x²+2y的值