2) 45 * 4² 3² * 5 * 4²
----------- = ----------------- = 1
80 * 3² 4² * 5 * 3₂
2) 7³ * 2³ 7³ * 2³
----------- = ----------- = 7/2
16 * 49 2⁴ * 7²
3) 11 * 9 * 5 11 * 3² * 5 1 * 1 * 5
--------------- = ----------------- = ------------- = 5/33
3³ * 11² 3³ * 11² 3 * 11