(X+Y)/(X²—XY+Y²)=3/7,怎么求X与Y的值?X与Y都是整数,
若xy=3,x²+y²=10,求x+y与x-y的值
x,y都是自然数,且x(x-y)-y(y-x)=12,求x+y-xy的值
已知(x+y)²=1 (x-y)²=49,求x²+y²与xy的值
(x+y)²=1,(x-y)²=49,求x²+y²与xy的值
x/y=3,求x²+y²-xy/x²-y²的值.
已知(x+y)(x+y)=25,(x-y)(x-y)=9求xy与xx+yy的值
整数x,y满足x2-y2=2xy,求x-y/x+y的值
x/xy-y²与y/x²-xy 通分
若|2x+y-3|与(y-2)²互为相反数,求4x²y-3xy的值?
2x+2y/x-y与(x+y)²/xy 怎么通分
2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分
若|3-x|与|x+y|互为相反数,求(x-y)/xy的值.