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Toán Lớp 10: Cho biết a+b+c=0. Cmr: (a²+b²+c²) ²=2 ($a^{4}$+$b^{4}$+$c^{4}$ )

Home/ Toán Lớp 10: Cho biết a+b+c=0. Cmr: (a²+b²+c²) ²=2 ($a^{4}$+$b^{4}$+$c^{4}$ )

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