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Toán Lớp 8: `(x+y)^3 – (x-y)^3 = 2y(y^2 + 3x^2)` Chứng minh ạ

Home/ Toán Lớp 8: `(x+y)^3 – (x-y)^3 = 2y(y^2 + 3x^2)` Chứng minh ạ

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