`b) B = ( 4^5 . 10 . 5^6 + 25^5 . 2^8 ) : ( 2^8 . 5^4 + 5^7 . 2^5 )`
`B = [ ( 2^2 )^5 . 2 . 5 . 5^6 + ( 5^2 )^5 . 2^8 ] : ( 2^5 . 2^3 . 5^4 + 5^4 . 5^3 . 2^5 )`
`B = [ 2^10 . 2 . 5^7 + 5^10 . 2^8 ] : [ 2^5 . 5^4 . ( 2^3 + 5^3 ) ]`
`B = [ 2^8 . 2^2 . 2 . 5^7 + 5^7 . 5^3 . 2^8 ] : [ 2^5 . 5^4 . ( 2^3 + 5^3 ) ]`
`B = [ 2^8 . 2^3 . 5^7 + 5^7 . 5^3 . 2^8 ] : [ 2^5 . 5^4 . ( 2^3 + 5^3 ) ]`
`B = [ 2^8 . 5^7 . ( 2^3 + 5^3 ) ] : [ 2^5 . 5^4 . ( 2^3 + 5^3 ) ]`
`B = 2^3 . 5^3 = ( 2 . 5 )^3`
`B = 10^3 = 1000`