已知:4x²+2y²-4xy+10y+25=0,求x+y的值
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知:4x²+2y²-4xy+10y+25=0,求x+y的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+3xy-4y²=0,求(x-2y)除以(x+2y)的值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知:x/y=4/5,求y²/(x²-xy+y²)的值
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²的值
已知X²+5Y²-4XY+2Y+1=0求2X-Y的值
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4