7+(-2)-3.4=7-2-3.4=5-3.4=1.6
—21.6+3-7.4+(-2/5)=-18.6-7.4-0.4=-26-0.4=-26.4
31+(-5/4)+0.25=31-1.25+0.25=31-1=30
7-(-1/2)+1.5=7+0.5+1.5=7.5+1.5=9
49-(-20.6)-3/5=49+20.6-0.6=49+20=69
(-6/5)-7-(-3.2)+(-1)=-1.2-7+3.2-1=-1.2+3.2-7-1=2-7-1=-6
7+(-2)-3.4=7-2-3.4=5-3.4=1.6
—21.6+3-7.4+(-2/5)=-18.6-7.4-0.4=-26-0.4=-26.4
31+(-5/4)+0.25=31-1.25+0.25=31-1=30
7-(-1/2)+1.5=7+0.5+1.5=7.5+1.5=9
49-(-20.6)-3/5=49+20.6-0.6=49+20=69
(-6/5)-7-(-3.2)+(-1)=-1.2-7+3.2-1=-1.2+3.2-7-1=2-7-1=-6