2^20*(0.25)^12/0.5^11*4^3
=2^20*(1/4)^12/(1/2)^11*4^3
=2^20*[(1/2)^2]^12/(1/2)^11*(2^2)^3
=2^20*(1/2)^24/(1/2)^11*2^6
=2^20*2^(-24)/2^(-11)*2^6
=2^[(20-24)-(-11)-6]
=2^[-4+11-6]
=2^1
=2
2^20*(0.25)^12/0.5^11*4^3
=2^20*(1/4)^12/(1/2)^11*4^3
=2^20*[(1/2)^2]^12/(1/2)^11*(2^2)^3
=2^20*(1/2)^24/(1/2)^11*2^6
=2^20*2^(-24)/2^(-11)*2^6
=2^[(20-24)-(-11)-6]
=2^[-4+11-6]
=2^1
=2