已知x+y=5,则x(x-y)+5y(x+y)+(x^3-3y^2)的值是
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x-y=-3y+5,则式子x+2y-1的值是?
已知x-2y/3y-x=2/3,则y/x的值是
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
已知3x-2y/x+y=5/3求x;y的值
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值
已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值