已知x2-y2=xy(xy不等于0)则x/y-y/x=____
1个回答
x/y-y/x
=x²/xy-y²/xy
=(x²-y)/xy
=xy/xy
=1
相关问题
已知2x^2-3xy+y^2=0(xy不等于0),则x/y+y/x的值是?
已知x^2+xy-2y^2=0 (x不等于0,y不等于0),求x/y-y/x-(x^2+y^2)/xy的值
已知x^2-3xy+2y^2=0(xy≠0),则x/y+y/x=
已知3x^2+xy-2y^2=0(x y都不等于0),求x/y - y/x - (x^2+y^2)/xy的值
已知xy不等于0,且2x^2-3xy-2y^2=0,求x/y
已知x-y=3xy,则[2x+3xy−2y/x−2xy−y]=______.
已知x-xy=20,xy-y=-10,则x-y=?,x+y-2xy?
已知(x+y)²=3,(x-y)²=,则[(xy+2)(xy-2)-2x²y²+
已知x+y=1,xy=-2,则x^2+y^2等于