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Yasua
2 năm trước
Cho $(y - z)^{2}$ + $(z - x)^{2}$ + $(x - y)^{2}$ = $(y + z - 2x)^{2}$ + $(z + x - 2y)^{2}$ + $(y + x - 2z)^{2}$ CMR : x = y = z
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