$7,9+81,2 = $  

$334,53-24,23 = $  

$7,42-6,42 = $  

$1,432+3,47 = $  

$17,3+34,3 = $  

$81,5-0,7 = $  

$18,4+57,67+31,29 = $  

$5,103-4,09 = $  

$1,7+8,7+4,5+57,5 = $  

$81,889-8,22 = $