x+y=3,xy=-2,求x(x+y)(x-y)-x{(x+y)的2次方} \(≥▽≤)/~
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知x-5y=0,求分式【(3x+y)/(x的2次方-2xy+y的2次方)】×(y-x)的值
x+y 3次方 公式是不是 = (x+y)(x^2-xy+y^2)?
已知x/y=2,求x的2次方-xy+3y的2次方/x的2次方+xy+6y的次方的值
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值.
已知x-3y=0,求(2x+y)(x-y)/x^2-2xy+y^2的值
已知x-3y=0,求2x+y/x-2xy+y乘(x-y)的值
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y