x+y=-5,xy=3,求(X+1)
x(x-1)-(x平方-y)=-3,求x平方+y平方-2xy
已知x+y=1,xy=-2,试求代数式(xy+5x-2y)-(-3xy+2x-5y)的值.
已知x+y=1,xy=-2,试求代数式(xy+5x-2y)-(-3xy+2x-5y)的值
1.已知x+y=-4,xy=3,求5(2分之1xy+2y)+[6x-(2xy+y-3x)]的值
已知(x+2)*+|y+1|=0求5xy*-{2x*y-【3xy*-(4xy*-2x*y)】}的值
已知1/x-1/x=3,求x-xy-y分之5x+xy-5y的值
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值
已知1/x+1/y=5,求(3x-5xy+3y)/(x+xy+y)的值?
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
若1/x+1/y=5,求3x+4xy+3y/x+3xy+y的值
已知1/x+1/y=3,求(3x-5xy+3y)/(x-2xy+y)