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 2x^5.
The GCF is 6.
The GCF is 9.
The GCF is 4.
The GCF is 30.
50
The GCF is: 1
The GCF is 27.
The GCF is 1.
The GCF is 2.
The GCF is 3.
The GCF is 5.
The GCF of 125, 200 is 25.