4*4*4*4*4*4*4 = [tex]4^{7}[/tex]
[tex]5^7 * 5^{12} : 5^8 = 5^{7+12-8} = 5^{11}[/tex]
[tex]\frac{(6^7)^2}{(6*6^3)^3}[/tex] = [tex]\frac{6^14}{6^12} = 6^2[/tex]
[tex]\frac{(7^7:7^2)^4}{7} = \frac{7^{20}}{7^1} = 7^{19}[/tex]
[tex]2^{15} * 4^{15} = 2^15 * (2^2)^{15} = 2^{15} * 2^{30} = 2^{45}[/tex]
[tex]45^7 : 5^7 = (45:5)^7 = 9^7[/tex]
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