3x的平方+(-2分之3 x+3分之1 y的平方)(2x-3分之2y),其中x=-3分之1,y=3分之2,求值
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3x的平方+(-2分之3 x+3分之1 y的平方)(2x-3分之2y),其腊轮中x=-3分之1,y=3分盯散之2,求值
3x^2+(-3 x/2+ y^2/3)(2x-2y/3)
=3x^2+(-3 x^2+ 2xy^2/3+xy-2y^3/9)
=3x^2-3 x^2+ 2xy^2/3+xy-2y^3/9
= 2xy^2/3+xy-2y^3/9
=2(-1/3)(2/凯局氏3)^2/3+(-1/3)(2/3)-2(2/3)^3/9
=-8/81-2/9-16/243
=(-8*3-2*27-16)/243
=-94/243
3x^2+(-3 x/2+ y^2/3)(2x-2y/3)
=3x^2+(-3 x^2+ 2xy^2/3+xy-2y^3/9)
=3x^2-3 x^2+ 2xy^2/3+xy-2y^3/9
= 2xy^2/3+xy-2y^3/9
=2(-1/3)(2/凯局氏3)^2/3+(-1/3)(2/3)-2(2/3)^3/9
=-8/81-2/9-16/243
=(-8*3-2*27-16)/243
=-94/243
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