已知:x+y=1,求(x²-y²)²-2(x²+y²)²的值
(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2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
已知|x+y+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
(1)已知x²+y²-2x+4y+5=0,求x、y的值
已知,x-y=5,xy=6,求(x+y)²-2x-2y+1的值
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x² +y²+5/4=2x+y,求y-x的值
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(x-y)的值