Take the lowest common power of each variable. In this case, if I understand the question correctly, that's x to the power 5. Separately, take the gcf of the numbers. Multiply everything together.
The GCF is 6.
The GCF is 9.
The GCF is 4.
The GCF is 30.
50
The GCF is 1.
The GCF is: 1
The GCF is 27.
The GCF is 3.
The GCF is 2.
The GCF is 5.
The GCF of 125, 200 is 25.