`a, 2^{9} . 8^{6}`
`= 2^{9} . (2^{3})^{6}`
`= 2^{9} . 2^{18}`
`= 2^{27}`
`= (2/1)^{27}`
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`b, 36^{8} : 6^{10}`
`= (6^{2})^{8} : 6^{10}`
`= 6^{16} : 6^{10}`
`= (6/1)^{6}`
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`c, {2^{9} . 9^{10}}/3^{11}`
`= {2^{9} . (3^{2})^{10}}/3^{11}`
`= {2^{9} . 3^{20}}/3^{11}`
`= {2^{9} . 3^{9}}/1`
`= 2^{9} . 3^{9}`
`= (2.3)^{9}`
`= (6/1)^{9}`