(m²-9分之m+15)-(m-3分之3)并求当m=-2时原式的值

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(m²-9分之m+15)-(m-3分之3)并求当m=-2时原式的值
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(m²-9分之m+15)-(m-3分之3)并求当m=-2时原式的值
(m²-9分之m+15)-(m-3分之3)
并求当m=-2时原式的值

(m²-9分之m+15)-(m-3分之3)并求当m=-2时原式的值
原式=(m+15)/(m+3)(m-3)-3(m+3)/(m+3)(m-3)
=(m+15-3m-9)/(m+3)(m-3)
=-2(m-3)/(m+3)(m-3)
=-2/(m+3)
=-2/(-2+3)
=-2