再求值
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再求值再求值再求值因m为方程的根,代入是m²+3m-1=0,即m²+3m=1所以（m-3)/(3m²-6m)÷[(m+2)-5/(m-2)]=（m-3)/3m(m-2)÷
再求值
再求值
再求值
因m为方程的根,代入是m²+3m-1=0,即m²+3m=1
所以
（m-3)/(3m²-6m) ÷ [ (m+2) - 5/(m-2)]
=（m-3)/3m(m-2) ÷ [ (m+2)(m-2) -5]/(m-2)
=（m-3)/3m(m-2) ÷ (m+3)(m-3)/(m-2)
=（m-3)/3m(m-2) X (m-2)/ (m+3)(m-3)
=1/3m(m+3)
=1/3(m²+3m)
=1/3x1
=1/3
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