已知x²+y²-10x+8y-41=0,求(2x-y)²-2(2x-y)(x+2y)+(x
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知x²-y²=10,求[(x+y)³-2y(x+y)²-4(x+y)]÷(x+
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x-y/x=x/x-2y(y不等于0),求x:y的值
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.