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Toán Lớp 8: Cho a + b + c = 0. Chứng minh a^4+ b^4+ c^4= 2.(a.b + a.c + b.c)

Home/ Toán Lớp 8: Cho a + b + c = 0. Chứng minh a^4+ b^4+ c^4= 2.(a.b + a.c + b.c)

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