已知:8y^3=-27,16(x-2)^2=121,求:x+y的值?

23.已知(x+y)3次+8*x的平方*y-16x*y的平方=18,x+2y=3,求x,y的值 已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值 已知x-y=3,x+y=8,问x^2 -y^2=? 已知x-2y=2,求4x-y-8分之3x+y-6 已知16x^2=9,y^3=8,求x+y的值 已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 已知:8y^3=-27,16(x-2)^2=121,求:x+y的值? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x^2+y^2-16x-8y+25=0,求y/x-x/y的值 已知2x+2y=-8,4x+y=15求（x-y)^-(3x+2y)^ 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 已知√¯x+3¯+y²-8y=-16,求x+2y的平方根. 已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值 已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/(8x)) 已知x-2y=2010,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值 已知:x-2y=2009,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x 的值