已知x+y=3,xy=-2求,【3x-5y+4xy]-[6x-2y+6xy]的值
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
已知x+y=4,xy=-2,求代数式3(xy+2y)-(xy-6x)的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知x/y=2,求 [x^2-xy+3xy^2 ] / [ x^2+xy+6y^2]的值
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
已知x+y=3,xy=-2求,【3x-5y+4xy]-[6x-2y+6xy]的值
1.已知x+y=-4,xy=3,求5(2分之1xy+2y)+[6x-(2xy+y-3x)]的值
已知X-Y=5,XY=3,求(6X-4Y+5XY)-(3X-Y+2XY)的值