计算 3x【xy-2x(y-1/3x)】+3y(x2次-y2次)
2x2+xy-3y2+x+4y-1因式分解
x(x-1)-(x2-y)=-3,求x2-y2-2xy的值
x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
x2-2xy+y2+3x-3y+2.
用待定系数法分解因式1.多项式3x2+5xy-2y2+x+9y+n能被3x-y+4整除,则n=2.2次3项式当x=1时其
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是
已知x2-2xy=3y2且x,y为非零实数 求:(1)2x+y/x-2y (2)2x2-3y2+5xy/x2+xy+y2
若x+y=-1,则x的4次+5x的3次y+x方y+8x方y方+xy方+5xy的3次+y的4次的值等于()
已知x2+y2+2x-8y+17=0,求x的2005次+xy的值
已知实数x、y满足2x2-7xy+3y2=0,求x:y