化简求职:2xy^2-[3xy^2-2(x^2y-(1/2)xy^2)]-2x^2y其中x=-2/3,y=-1/2

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化简求职:2xy^2-[3xy^2-2(x^2y-(1/2)xy^2)]-2x^2y其中x=-2/3,y=-1/2
化简求职:2xy^2-[3xy^2-2(x^2y-(1/2)xy^2)]-2x^2y其中x=-2/3,y=-1/2

化简求职:2xy^2-[3xy^2-2(x^2y-(1/2)xy^2)]-2x^2y其中x=-2/3,y=-1/2
2xy²-[3xy²-2(x²y-(1/2)xy²)]-2x²y
=（2-3）xy²+2x²y+(1/2)xy²-2x²y
=(1/2)xy²-xy²
=-(1/2)xy²
x=-2/3,y=-1/2
带入,得
-(1/2)×-2/3×（-1/2）²
=1/12

(-3xy+2xy)-(4xy+xy) 化简求职:2xy^2-[3xy^2-2(x^2y-(1/2)xy^2)]-2x^2y其中x=-2/3,y=-1/2 3xy-3xy-xy+2yx 3xy-4xy-（-2xy） 3xy-4xy-（-2xy） 2xy.(-3xy)÷(xy) 2xy-xy-(-3xy)= [(2xy-3)(2xy+3)+(xy+3)^2]/(-xy) xy－3xy＋2xy－xy 3xy^2*(-2xy) 计算 -4x^2y+3xy^2+x^2y-2xy^2先化简，在求职 3xy+2（x^2+2y）-(3xy+3x^2)其中x=-2 y=-1 3(xy-2z)+(-xy+2z)怎样化简 3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x) 3(xy－xy)－2(xy＋xy)＋3xy 1.3xy -4xy-(2xy) 3xy²-[xy-2(xy-3/2x²y)+3xy²]+3xy²,其中x=3,y=-1/3 化简求值 1/2xy(2/3xy²-2xy) 3(xy-z)^2-(2xy+z)(-z+2xy)