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合并同类项:x^2y^2+3xy-7x^2y^2-5/2xy-1+5x^2y^2=
人气:176 ℃ 时间:2019-08-19 03:03:15
解答
x^2y^2+3xy-7x^2y^2-5/2xy-1+5x^2y^2
=(x^2y^2-7x^2y^2+5x^2y^2)+(3xy-5/2xy)-1
=-x^2y^2+1/2xy-1
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