-6x-y-7x+6x-2y-10x+8y+x+6x-8y的值
-6x-y-7x+6x-2y-10x+8y+x+6x-8y的值
-8(2x-y)-{7x-[6x+2y-(10x-8y)]}
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
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
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