A = 7xy^2 5xy^2 + 3xy^2 xy^2 + 1

请输入您的数学问题…… a = 7xy^2 - 5xy^2 + 3xy^2 - xy^2 + 1

问题

a = 7 x y^{2} - 5 x y^{2} + 3 x y^{2} - x y^{2} + 1

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