$17{,}17+0{,}3$

$18{,}7-1{,}87$

$1{,}2\cdot0{,}12$

$0{,}8:0{,}32$

$0{,}32:0{,}6$

$0{,}0123:1000$

$0{,}0123\cdot100$

$5{,}5\cdot0{,}12:0{,}1$

$\left(2{,}08+9{,}2\right)-6{,}99$

$\left(9\cdot0{,}8-0{,}70\right):\left(0{,}6+0{,}5\right)$