First, we have to find the variables that appear on all monomials
yz
x3y3z4= x.x.y.y.y.z.z.z.z
y2z4= y.y.z.z.z.z
xy2z2= x.y.y.z.z
So, the greatest common factor (GCF)
Is the factors that they have in common:
y^2 z^4
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