Question

[9]+[-8.5]+[8]+[-7.5]+[7]+[6.5]+[6]+[-5.5]+[5]+[-4.5]

Answer 1

$|9|+|-8.5|+|8|+|-7.5|+|7|+|6.5|+|6|+\+|-5.5|+|5|+|-4.5|= \ 9+8.5+8+7.5+7+6.5+6+5.5+5+4.5=\= 9+8+7+6+5+8.5+7.5+6.5+5.5+4.5=\=35+32.5=67.5$