`#Mon`
`a)A=(3+1)(3^2+1)(3^4+1)(3^8+1)(3^{16}+1)`
`=>A(3-1)=(3^2-1)(3^2+1)(3^4+1)(3^8+1)(3^{16}+1)`
`=>2A=(3^4-1)(3^4+1)(3^8+1)(3^{16}+1)`
`2A=(3^8-1)(3^8+1)(3^{16}+1)`
`2A=(3^{16}-1)(3^{16}+1)`
`2A=3^{32}-1`
`=>2A=B`
`<=>A<B`
`b)A=2011.2-13`
`=(2012-1)(2012+1)`
`=2012^2-1`
`=>2012^2-1<2012^2`
`=>A<B`