858 or 862 answers-
1.) ( 3*1)*100+ (3+1)*10 + (3-1)
2.) (4*2)*100+(4+2)*10+(4-2)
3.) (5*1)*100+(5+1)*10+(5-1)
4.) (3*2)*100+(3+2)*10+(3-2)
5.)(2*4)*100+(2+4)*10+(2-4) =8*100+6*10+(-2) =860-2 =858
or 862 as 4*2 = 2*4
2x4=8,2+4=6,2-4=-2 ie 860-2=858