2.若x²-4xy+4y²=0,则x:y的值为( )
若(x-4y)(x+3y)=0 且xy>0 则分式x+3y/2x-y的值为
若|2x+y-1|+(x-2y)²=0,则x²+xy+y²的值为?
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.
1、若有理数x、y满足|4-2x|+(y-3x)平方=0,则代数式x平方-2xy+y平方的值为_____________
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(xy≠0),则(y/x)+(x/y)的值是
1.已知x^2-4y^2=0,则分式(x^2-xy+y^2)/(x^2+xy+y^2)的值为_________.
已知y=(x²-3xy-2y²)/2y,则x:y的值为
若有理数X、Y满足x²-4x+y²+6y+13=0,求xy的值
若x/y=2,则分式x²-y²/xy的值为
若x/y=2,则分式x²-y²/xy的值为?
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?