当x=11/75 ,y=25/44 求(x+y)^-(x-y)^的值
当x=-3,y=-2时,求(x-y)(x-y)2(x-y)11的值.
(x+y)(x+y+10)+25=0 x-y=3.求x,y的值
当x=2,y=-1时,求代数式(x+y)(x-y)+(x-y)²-(x²-3xy)的值
已知x=22/75,y=25/44,求(x+y)-(x-y)
先化简再求值X-{Y-2X+〔3X-2(2X+Y)+5Y〕},并求当X-Y=2的值
当x=5 y=3时,求(x-y)2-(x+y)的值
当x+y/x-y=1/2时,求代数式x-y/x+y-2x+2y/x-y的值
当2x-y/x+y=3时,求代数式2x-y/2x+2y+x+y/6x-3y的值.
当x-y/x+y=2009/2010时,求代数式2009(x+y)/x-y+4020(x-y)/x+y的值.
已知x-y/x=x/x-2y(y不等于0),求x:y的值
已知x,y为自然数,x>y且满足(x+y)+(x+xy-y)+x/y=243求x+y的值
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.