2xy+y+x=83求x+y=多少?
1/x-1/y=3 求x-3xy-y/2x-xy-2y 等于多少
x^2+xy+x=36,y^2+xy+y=20,求x+y.
如果x^2+xy+y-14,y^@+xy+x=28,求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?
x+y分之一=5,xy+xy分之一=18,求y+x分之一=多少
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
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x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y