`a)5.5^{3}.5.5^{20}=5^{1+3+1+20}=5^{25}`
`b)b^{20}:b^{10}:b^{10}=b^{20-10-10}=b^0=1`
`(b \ne 0)`
`c)y^{11}:y^{10}:y=y^{11-10-1}=y^0=1`
`(y \ne 0)`
a) \(5.5^3.5.5^{20}=5^{25}\)
b) \(b^{20}:b^{10}:b^{10}=b^0=1\) \(\left(b\ne0\right)\)
c) \(y^{11}:y^{10}:y=y^0=1\) \(\left(y\ne0\right)\)