Question

$40 : ( - 5 - 3 )$
$13,8*1,6-13,8* \frac{3}{5}$
$57 : 3 \frac{6}{17} - 17,8 + 1$

Answer 1

$1) ~40: (-5-3)=40:(-8)=-5 \\ 2)~13,8*1,6-13,8* \frac{3}{5} = 13,8*(1 \frac{3}{5}- \frac{3}{5})= 13,8 \\ 3)~ 57 :3 \frac{6}{17}-17,8+1=57: \frac{57}{17}-17,8+1=17-17,8+1=0,2$