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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: cho a+b+c=0.rút gọn C=a2/(a2-b2-c2)+b2/(b2-c2-a2)+c2/(c2-a2-b2)

Toán Lớp 8: cho a+b+c=0.rút gọn C=a2/(a2-b2-c2)+b2/(b2-c2-a2)+c2/(c2-a2-b2)

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222-9+11+12:2*14+14 = ? ( )