已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-1/2x+y的值,要详细点的过程
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-1/2x+y的值,要详细点的过程
已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,
已知x2-4x-1=0,求代数式(2x-3)2-(x+y)(x-y)-y2的值
已知x2+4x+y2-2y+5=0,求x,y的值.
已知实数x,y满足x2+y2-4x+1=0,求2x+y的取值范围?
已知2x=y,求代数式[(x2+y2)-(x-y)2+2y(x-y)]÷(4y)的值.
已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值
已知实数X、Y满足X2+Y2-4X+1=0,分别求X-Y,Y/X,X2+Y2的最大值(2表示平方),要具体过程.
已知2x+y=7,x2+y2=5,求(4x+2y)2-3x2-y2+2(1-y2)的值.
已知点(x,y)在圆(x-2)^2+(y+3)^2=1上,求√(x2+y2+2x-4y+5)的最大值和最小值
已知x-y+1,X2+Y2=25 求(x+y)2和x2-xy+y2的值
已知实数x,y满足x2+y2+4x+3=0,求(y-2)/(x-1)的值域.