a ) 20 - 4,107 - 0,893
= 20 - ( 4,107 + 0,893 )
= 20 - 5 = 15
b ) 20,08 / 2,5 / 4
= 20,08 / ( 2,5 * 4 )
= 20,08 / 10 = 2,008
a ) 20 - 4,107 - 0,893
= 20 - ( 4,107 + 0,893 )
= 20 - 5 = 15
b ) 20,08 / 2,5 / 4
= 20,08 / ( 2,5 * 4 )
= 20,08 / 10 = 2,008