已知x=2,y=-3/2时,求(x²+y²)²-(x²-y²)平方的值
已知x²+4y平方-2x=4y-2,求(2x-3y)²-(3y-x)²的值
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
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的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知x+3y=2,求代数式(x²-y²/x+y)-【2(x+y)】的值
已知x²+y²+2x-6y+10=0,求x的y的平方的值
已知x-3y=0,y≠0,求x²-2xy+y²分之2x+y×(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xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
(1)已知(x+y-1)²+(根号2x-y+4)=0,求x的y平方+y的x平方的值.【注:“2x-y+4”都在