a) 2,(33)-5,01(4)+3,125
=2,333-5,014+3,125
=0,444
b) \(\left(8,21-3,\left(05\right)+1,2\right)\cdot3,\left(1\right)\)
\(=\left(8,21-3,050+1,2\right)\cdot3,111\)
\(=19,78596\)
c) \(\left(1,5+3,\left(5\right)\right):\left(2,1-3,2\right)\)
\(=\left(1,5+3,555\right):\left(-1,1\right)\)
\(=-\dfrac{5,055}{1,1}=-4,\left(5954\right)\)