已知(x²+y²)(x²-1+y²)=12 ,求x²+y²的
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
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x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知x²-y²=12,x+y=6,求x,y的值
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知|x+y+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
已知x²+y²=12,x-y=4,求(x+y)²的值.
已知(x²+y²)(x²-1+y²)-12=0,求x²+y²
(1)已知x²+y²-2x+4y+5=0,求x、y的值