1) (-9)-(-13)+(-20)+(-2)
原式=-9+13-20-2
=（-9-20-2）+13
=-18
(2) 3+13-(-7)/6
原式=16+7/6
=96/6+7/6
=103/6
(3) (-2)-8-14-13
原式=-2-8-14-13
=-37
(4) (-7)*(-1)/7+8
原式=1+8
=9
(5) (-11)*4-(-18)/18
原式=-44+1
=-43
(6) 4+(-11)-1/(-3)
原式=4-11+1/3
=-7+1/3
=-21/3+1/3
=--20/3
(7) (-17)-6-16/(-18)
原式=-17-6+8/9
=-23+8/9
=-207/9+8/9
=-199/9
(8) 5/7+(-1)-(-8)
原式=5/7-1+8
=5/7+7
=54/7
(9) (-1)*(-1)+15+1
原式=1+15+1
=17
(10) 3-(-5)*3/(-15)
原式=3-1
=2
(11) 6*(-14)-(-14)+(-13)
原式=-84+14-13
=-83
(12) (-15)*(-13)-(-17)-(-4)
原式=195+17+4
=216
(13) (-20)/13/(-7)+11
原式=140/13+11
=283/13
(14) 8+(-1)/7+(-4)
原式=8-1/7-4
=4-1/7
=27/7
(15) (-13)-(-9)*16*(-12)
原式=-13-1728
=-1741
(16) (-1)+4*19+(-2)
原式=-1+76-2
=76-3
=73
(17) (-17)*(-9)-20+(-6)
原式=153-20-6
=153-26
=127
(18) (-5)/12-(-16)*(-15)
原式=-5/12-240
=-2885/12
(19) (-3)-13*(-5)*13
原式=-3+845
=842
(20) 5+(-7)+17-10
原式=22-17
=5