先化简,再求值3x²y-[2xy²-2(xy-3/2x²y)+2xy]-2x²y
来源:学生作业帮 编辑:拍题作业网作业帮 分类:数学作业 时间:2024/05/18 21:14:59
先化简,再求值3x²y-[2xy²-2(xy-3/2x²y)+2xy]-2x²y
先化简,再求值:3x²y-[2xy²-2(xy-3/2x²y)+2xy]-2x²y,其中x,y满足(x+2)²+丨y-1丨=0
先化简,再求值:3x²y-[2xy²-2(xy-3/2x²y)+2xy]-2x²y,其中x,y满足(x+2)²+丨y-1丨=0
x,y满足(x+2)²+丨y-1丨=0,则x+2=0,x=-2;y-1=0,y=1
3x²y-[2xy²-2(xy-3/2x²y)+2xy]-2x²y=3x²y-(2xy²-2xy+3x²y+2xy)-2x²y
=3x²y-2xy²-3x²y-2x²y=-2xy²-2x²y=-2xy(y-x)
将x=-2,y=1代入得-2xy(y-x)=-2X(-2)(1+2)=12
3x²y-[2xy²-2(xy-3/2x²y)+2xy]-2x²y=3x²y-(2xy²-2xy+3x²y+2xy)-2x²y
=3x²y-2xy²-3x²y-2x²y=-2xy²-2x²y=-2xy(y-x)
将x=-2,y=1代入得-2xy(y-x)=-2X(-2)(1+2)=12
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
先化简,再求值 4(xy²+3xy-2x²y)-[12xy-3(3x²y-2xy²
先化简在求值(x+y)²-(x-y)(x+y)-(xy)²÷(xy),其中x,y是方程组『3x+2y
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
先化简在求值:(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],其中X=-3/2,Y=2
先化简在求值:(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],其中X=-3/2,Y=-
化简求值3x²y-[2xy²-2(xy-3/2x²y)+xy]+3xy² ,当x
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
化简求值:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
先化简再求值:2x²+(-x²+3xy+2y²)-(-x²-xy+2y²
先化简再求值,3xy²(xy+2y²-x²)+3x³y²,其中x=2,