3(2x^y-3xy^2)-(xy^2-3x^2y),其中x+1/2,y=-1

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3(2x^y-3xy^2)-(xy^2-3x^2y),其中x+1/2,y=-1
3(2x^y-3xy^2)-(xy^2-3x^2y),其中x+1/2,y=-1

3(2x^y-3xy^2)-(xy^2-3x^2y),其中x+1/2,y=-1
3(2x^2y-3xy^2)-(xy^2-3x^2y)
=6x²y-9xy^2-xy²+3x²y
=9x²y-10xy²
=9*1/4*(-1)-10*(1/4)*1
=-9/4-10/4
=-19/4

2x²y-3(2xy-xy)-xy xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2 （X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x） x^2-xy-6y^2+3xy+y+2 计算：3xy[2xy-x（y-2）+x] 计算3xy[2xy-x(y-2)+x-1] （-3x^y+2xy)-( )=4x^+xy 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] (-3xy+2xy)-(4xy+xy) x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) (-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)] 计算题 xy【y^2+x^2】-y^2【xy+2x】-3xy xy(xy+1)+xy+3-2(x+y+1/2)-(x+y-1)^2因式分解 2x平方y+3x平方Y-2XY平方+2XY+XY是多少啊 3(x^2y+xy)-4(xy-2x^2y)-(-xy)