-(2xy-y^2+1/2x^2)-2(1/3xy+1/4y^2-x^2)
=-2xy+y^2-1/2x^2-2/3xy-1/2y^2+2x^2
=3x^2/2-8xy/3+y^2/2
-(2xy-y^2+1/2x^2)-2(1/3xy+1/4y^2-x^2)
-(2xy-y^2+1/2x^2)-2(1/3xy+1/4y^2-x^2)
数学人气：540 ℃时间：2019-10-31 02:36:28
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