3.)
2^10/2^2×2^5=2^10/2^7=2^3=8
7^15/7^8×7^2=7^15/7^10=7^5=16807
5^12/5^7×5=5^12/5^8=5^4=625
2^6×2^3/2^9=2^9/2^9=1
6^7×6^3/6^2=6^10/6^2=6^8=1679616
3^12×3/3^9=3^13/3^9=3^4=81
4^3×4^5/4^8=4^8/4^8=1
4.)
a^6×a^3/a^5×a^2=a^9/a^7=a^2
a^13×a/a^7×a^3=a^14/a^10=a^4
a^12÷a^4/a^2×a^3=a^8/a^5=a^3
a^15÷a/a^4×a^2=a^14/a^6=a^8
a^9÷a^3/a^5÷a^2=a^6/a^3=a^3
a^8÷a/a^3×a=a^7/a^4=a^3
a^8×a^2/a^9÷a=a^10/a^8=a^2
