作业帮4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy&#
来源：学生作业帮 编辑：作业帮 分类：数学作业 时间：2024/05/09 02:22:52
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy²,其中x=2,y=-3
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy²
=4x²y-1/2{x²y-[5x²y-4xy²-1/2xy]}+3xy²
=4x²y-1/2{x²y-5x²y+4xy²+1/2xy}+3xy²
=4x²y-1/2{-4x²y-4xy²-1/2xy}+3xy²
=4x²y+2x²y+2xy²+1/4xy+3xy²
=6x²y+5xy²+1/4xy
=xy(6x+5y+1/4)
=-2×3×（6×2-5×3+1/4）
=-6×（-11/4）
=16.5
=4x²y-1/2{x²y-[5x²y-4xy²-1/2xy]}+3xy²
=4x²y-1/2{x²y-5x²y+4xy²+1/2xy}+3xy²
=4x²y-1/2{-4x²y-4xy²-1/2xy}+3xy²
=4x²y+2x²y+2xy²+1/4xy+3xy²
=6x²y+5xy²+1/4xy
=xy(6x+5y+1/4)
=-2×3×（6×2-5×3+1/4）
=-6×（-11/4）
=16.5
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
3x²y+xy²-[2xy²-4x²y+（x²y-2xy²）
(2x²y-3xy²)-3(x²y-2xy²)+2（x²y-4xy&#
4x²y-1/2{x²y-[5x²y-2(2xy²+1/4xy)]}+3xy&#
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
计算 2xy[4x²y²-3y（xy+x²y）-xy²]
求3xy²-4x²y-2xy²+ 5x²y的值,其中x,y满足|x-1|+(y+
因式分解xy²-2xy+x+2y-1
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
下列多项式:(1)x²+xy-y²;(2)-x²+2xy-y²;(3)xy+x&
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²