已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知x,y为实数,且2(x+2y)=x²+y²+5求代数式3x-4y分之x²+y²
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x²-y²=10,求[(x+y)³-2y(x+y)²-4(x+y)]÷(x+
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?