x/3y与3x/2y²
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
|x+2y+3|+(2x+y)²=0求x²-xy+y²
代数式3x²y,-2xy²,二分之一xy,-x²y,3x中,与5x²y是同类项的
(3x-2y)²(3x-2y)²(9x²+4y²)²
已知圆x²+y²+x-6y+m=0与直线x+2y-3=0
[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x,y满足x²+4x+y
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
计算:(1).(-2xy²)*(3x²y)²
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
x/y=2,求分式x²-xy+3y²/x²+xy+6y²
求一道计算题,{(2\3x²)-(2\x²+y²)*[(x²+y²\3