分式的加减
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原式=12/(m²-9)-2/(m-3)
=12/(m+3)(m-3)-2(m+3)/(m+3)(m-3)
=[12-2(m+3)]/(m+3)(m-3)
=(12-2m-6)/(m+3)(m-3)
=(6-2m)/(m+3)(m-3)
=-2(m-3)/(m+3)(m-3)
=-2/(m+3)
=12/(m+3)(m-3)-2(m+3)/(m+3)(m-3)
=[12-2(m+3)]/(m+3)(m-3)
=(12-2m-6)/(m+3)(m-3)
=(6-2m)/(m+3)(m-3)
=-2(m-3)/(m+3)(m-3)
=-2/(m+3)
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