化简求值3x²y-[2xy²-2（xy-3/2x²y)+xy]+3xy²其中x=

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/07/19 01:58:02

化简求值3x²y-[2xy²-2（xy-3/2x²y)+xy]+3xy²其中x=3、y=-1/3
急用呀

3/2x²y=(3/2)x²y
3x²y-[2xy²-2（xy-(3/2)x²y)+xy]+3xy²
=3x²y-[2xy²-2xy+3x²y+xy]+3xy²
=3x²y-2xy²+2xy-3x²y-xy+3xy²
=xy²+xy
=xy(y+1)
=3*(-1/3)*(-1/3+1)
=-2/3

先化简,再求值：3xy²(-x²y+2x³y²)-4xy(-xy²)· 已知2x²-3y²=xy,(xy≠0),求值（4xy-x²）／(xy+2y²)的计算:(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 ①先化简,再求值.4（3x²y—1/2xy²）—5（—xy²+3x²y）,其中x 已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值先化简再求值.4x²-8xy+4y²/ 2x²-2y² 其中 x=2 y=3 |x+2y+3|+(2x+y)²=0求x²-xy+y² 因式分解 x²-3xy+2y²+x-2 已知X²+XY=3,XY+Y²=2,则代数式X²+2xy的值为