`A = 1/2 : 0,5 - 1/4 : 0,25 + 1/8 : 0,125 + 2012`
`A = 1/2 : 1/2 - 1/4 : 1/4 + 1/8 : 1/8 + 2012`
`A = 1 - 1 + 1 + 2012`
`A = 2013`
`B = 2 2/3 + 5/9 + 4/9 : (30% - 1/10 ) - 2/9`
`B = 8/3 + 5/9 + 4/9 : 2/10 - 2/9`
`B = 8/3 + 5/9 + 20/9 - 2/9`
`B = 24/9 + 5/9 + 20/9 - 2/9`
`B =` $\frac{24 + 5 + 20 + 2}{9}$
`B = 51/9 = 17/3`