已知:x,y满足x²+y²-4x-6y+13=0,求(-y/x³)²÷(-1/x
已知x,y满足x²+y²-4x-6y+13=0,求(- y/x^3)^3÷(- 1/xy)^4.(x
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知实数x、y满足x²+y²+4x-6y+13=0
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.
已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x.
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
已知实数x y满足x²+y²+2x-4y+1=0 求下列最大值和最小值,(1)y/x-4 (2)2x
已知x²+y²+13-4x+6y=0,求(2x-y)²-2(2x-y)(x+2y)+(x+
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y