（-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2）
=-x^2+3xy-0.5y^2-0.5x^2-4xy+1.5y^2
=-1.5x^2-xy+y^2
所以填-xy
（-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2）=-0.5x^2+( )+y^2
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