已知x-y=9,xy=5.求(x+y)(x+y)的值?
已知x-y=9,xy=5.求(x+y)(x+y)的值?
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知x+y=-5,x*x+y*y=19求xy和(x-y)*(x-y)的值
已知(x+y)(x+y)=25,(x-y)(x-y)=9求xy与xx+yy的值
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知XY.Y=-3,求-XY(X.X.X.Y.Y.Y.Y.Y.Y.Y-3.X.X.Y.Y.Y.Y.Y-Y)的值.(过程完
已知,1/x+1/y=5.,求分式3x+xy+3y/x-2xy+y的值
已知x+y=-5,x*x*x+y*y=19,求xy和(x-y)的值
已知X+y=10,XY=24,求(X-Y)(X-Y)的值
已知1/x-1/y=2001,求分式x-xy-y/x-y的值