=5k(2m+8)/5m²k-80k=5k×2(m+8)/5k(m²-16)=2(m+4)/(m-4)(m+4)=2/m-4
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=5k(2m+8)/5m²k-80k=5k×2(m+8)/5k(m²-16)=2(m+4)/(m-4)(m+4)=2/m-4
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