1/2-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/21/2x-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/2
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1/2-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/21/2x-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/21/2-(2x-2/3
1/2-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/21/2x-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/2
1/2-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/2
1/2x-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/2
1/2-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/21/2x-(2x-2/3y2)+(-3/2x+1/3y^2)其中x=-1/4,y=-1/2
原式=1/2-2x+2/3y^2-3/2x+1/3y^2
=1/2-7/2x+y^2
=1/2+7/8+1/4
=13/8
1/2x+(-3/2x+1/3y2)-(2x-2/3y2)=
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