若x/y=-2,x^2-2xy-3y^2/x^2-6xy-7y^2的值
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值.
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
若x=y=6,xy=2,求2x+3y-3xy+(4xy-3x)-(4y-7)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/xy=3,求分式2x+3xy-2y/x-2xy-y的值.
已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.