(X+Y)+(X-Y)+(X/Y)+(X*Y)=1999求XY值
(X+Y)+(X-Y)+(X/Y)+(X*Y)=1999求XY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
正数x,y满足x^2-y^2=2xy,求(x-y)/(x+y)的值
有这样一道题:计算(x-y)[(x+y)(x+y)-xy]+(x+y)[(x-y)(x-y)+xy]的值,其中x=200
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知xy=2,x-y=3,求(x+y)(x-y)-y^2-(6x^2y-2xy^2)/2y的值.
已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-(6x2y-2xy平方)/2y的值
初中数学分式已知x/y=2,求(x*x-xy+3y*y)/x*x+xy+6y*y的值
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y=根号下(x-4)+根号下(4-x)+3,求代数式(x-y+4xy/x-y)(x+y-4xy/x+y)?
已知y-2x=10,求[2y(x-y)-(x-y)2+(x+y)2-2xy]÷4y的值.
1/x-1/y=2 求(2x+3xy-2y)/(x-xy-y)的值