这道题怎么解？详细过程

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由题意肆如，得
m²+3m-1=0
m(m+3)=1
所以
原式兆雹隐=(m-3)/[3m(m-2)] ÷(m²-9)/(m-2)
=(m-3)/族厅[3m(m-2)] ×(m-2)/[(m+3)(m-3)]
=1/[3m(m+3)]
=1/3

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先解方程，算出m ( m不等于2)再化简求值

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