已知x²+4y²-2x=4y-2,求(2x-3y)²-(3y-x)²的值,用完全
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-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2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知|2x-3y-4|=-(2x+y+4)²,求4x-2y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x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
(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x²+4y平方-2x=4y-2,求(2x-3y)²-(3y-x)²的值
已知x²+4y+y²—6y+13=0,求2x+3y的值