-3[y-(3x-3xy)]-[y+2(4x^2-4xy)]
=-3y+3(3x-3xy)-y-2(4x^2-4xy)
=-4y+9x-9xy-8x^2+8xy
=-8x^2-4y+9x-xy
-3[y-(3x-3xy)]-[y+2(4x^2-4xy)]
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3x^2 y+{xy-[3x^2 y-(4xy^2 +1/2xy)]-(4x^2 y+3/2xy)}
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(x^3+y^3)^2-4xy[x^4+x^2y^2+y^4-2xy(x^2-xy+y^2)]因式分解
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x+y=4,xy=2,2x^3y+4x^2y^2+2xy^3