a) -23+14-36+40+25=
=-9-36+65=
=-45+65=
=20
c) -41+38+12-36+10=
=-41+60-36=
=-41+24=
=-17
e) -85+34-25+36-18=
=-85+70-43=
=-15-43=
=-58
b) 10-5+7-15+20-15=
=-2+5=
=3
d) -6+4-10+3-7+1+3=
=-2-7-7+4=
=-16+4=
=-12
f) -122+343+411-723+324=
=-122+1028-723=
=-122+305=
=183
