y=2x²-8x+6的解
若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值
5x+6y+3x-4y+3-x+x =5x+3x-x+x+6y-4y+3 =8x=2y+3 谁能告诉我这题合并同类项的解
求方程x+2y-3x=4,3x-2y+x=6,3x+2y-5x=8的解
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
【2(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方=?
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
求x+y/3+x-y/2=6 3(x+y)-2(x-y)=28方程组的解
x+y=8,x-y=6求x^2-y^2-2x-2y的值
已知x^2+y^2-6x-8y+25=0,求分式y/x - x/y的值
已知x^2+y^2-6x-8y+25=0 求y/x-x/y的值
已知x,y满足x^2+y^2-6x+8y+25=0,求y^x的值