Answer:
[tex] \boxed{ \bold{ \frac{1}{ {a}^{15} } }}[/tex]
Step-by-step explanation:
[tex] ({m}^{3} ) \: \div \: {m}^{18} [/tex]
[tex] {m}^{3} \: \div \: {m}^{18} [/tex]
[tex] {m}^{ - 15} [/tex]
[tex] \boxed{ \boxed{{a}^{ - n} \: = \: \frac{1}{ {a}^{n} } }}[/tex]
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[tex] \boxed{ \bold{ \frac{1}{ {a}^{15} } }}[/tex]