若x²-y²=40,x+y=8/5,则x-y=(),
若x²-y²=40,x+y=8/5,则x-y=(),
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若【2x²-3y²-10y+5】²+根号x-2y,则x= y=
若4x=5y(y不等于0)则y²分之x²-y²=多少
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
x²+y²-6x+8y+25=0求(x-y)-²
已知x²+4x+y²-2y+5=0,则x+y=
x+y=3,x²+y²=5,求(x-y)^2014