1.
(31-13)*1.5=27
2.
17.1/(4/5-3/4)=342
3.
600*16%/40*1/5=96/8=12
4.
(236+35)/75%=361
5.
1.7-4/5=0.9
4.6+4/5=5.4
0.9/5.4=1/6