计算(21x^4y^3-35x^3y^2+7x^2y^2)/(-7x^2y)
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计算(21x^4y^3-35x^3y^2+7x^2y^2)/(-7x^2y)计算(21x^4y^3-35x^3y^2+7x^2y^2)/(-7x^2y)计算(21x^4y^3-35x^3y^2+7x^
计算(21x^4y^3-35x^3y^2+7x^2y^2)/(-7x^2y)
计算(21x^4y^3-35x^3y^2+7x^2y^2)/(-7x^2y)
计算(21x^4y^3-35x^3y^2+7x^2y^2)/(-7x^2y)
(21x^4y^3-35x^3y^2+7x^2y^2)/(-7x^2y)
=-3x^2y^2+5xy-y
计算(21x^4y^3-35x^3y^2+7x^2y^2)/(-7x^2y)
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