Toán Lớp 8: thụ gọn bt sau b, (x-y).(x^3+x^2y+xy^2+y^3)-(xy^2+y^3)-(4+y^4+y^4) -

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Toán Lớp 8: thụ gọn bt sau b, (x-y).(x^3+x^2y+xy^2+y^3)-(xy^2+y^3)-(4+y^4+y^4)