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数学
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(-x^2+3xy-0.5y^2)-(0.5x^2+4xy-1.5y^2)=-0.5x^2+( )+y^2
人气:440 ℃ 时间:2019-09-17 18:49:33
解答
(-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
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