1、
(1) | (2) | (3) | (4) |
-9 | 11 | -24 | 47 |
(5) | (6) | (7) | (8) |
0 | -43 | -35 | -7 |
2、
(1) | (2) | (3) | (4) |
0.6 | 10.2 | -7 | -6 |
3、解:(1)原式=[(+14)+(+26)]+[-4)+(-2)+(-3)]
=(+40)+(-9)=31;
(2)原式=(-83)+[(-41)+(+26)+(+15)]
=(-83)+0=-83;
(3)原式=[(-1.8)+(-0.2)]+(+0.7)+1.3]+(-0.9)
=(-2)+2+(-0.9)=-0.9;
(4)原式=【1/4+[+4(3/4)]】+【[-3(1/3)]+[(-6(2/3)]】
=5+(-10)=-5.
4、解:(1)(+1.2)+|-3.1|=1.2+3.1=4.3.
(2)-[4(2/3)+(-1/3)]=-4(1/3).
5、解:(1)(+3500)+(+1500)+(-300)+(-650)+(+600)+(-1800)
+(-250)+(-200)=2400(千克).
(2)(+18)+(-9)+(+7)+(-14)+(-6)+(+13)+(-6)+(-8)=-5(千米),
即B地在A地南边5千米处.
(18+9+7+14+6+13+6+8)a=81a(升).