文档介绍：(-38)+52+118+(-62)=
(-32)+68+(-29)+(-68)=
(-21)+251+21+(-151)=
12+35+(-23)+0=
(-6)+8+(-4)+12 =
27+(-26)+33+(-27)
12+35+(-23)+0=
39+[-23]+0+[-16]=
[-18]+29+[-52]+60=
[-3]+[-2]+[-1]+0+1+2=
[-301]+125+301+[-75]=
[-1]+[-1/2]+[+3/4]+[-1/4]=
[-7/2]+[+5/6]+[-]+4/5+19/6=
[-]+[-]++=
+[-17/5]+[-1/8]+[-]=
1-4/9 =
1-7/10=
8/15-5=
7-15=
2/8-5/8=
8/27-5 =
4-27 =
11/12-10/12=
16/21-1/7 =
4/ 2-(3+3 )=
1/3- 7/12-7/18=
1 -1/3-1 1/5 =
10-7/10=
5/24+3/8 =
-3/5
1-3/5=2/5
*1/13*2/3
1+(-2)+(-3)+4+5+(-6)+(-7)+8+9+(-10)+(-11)+12
-+13又6分之5+15又5分之4
(-7分之1)+(-7分之2)+1又7分之3
--(-3 )+-(+7 )
39+[-23]+0+[-16]=
[-18]+29+[-52]+60=
[-3]+[-2]+[-1]+0+1+2=
[-301]+125+301+[-75]=
[-1]+[-1/2]+[+3/4]+[-1/4]=
[-7/2]+[+5/6]+[-]+4/5+19/6=
[-]+[-]++=
+[-17/5]+[-1/8]+[-]=
+[-11/4]++12又5/7+[-3/8]=
[-4/9]+[-3/5]+[+11/8]+[+5/9]+[-1/8]+[-]=
练****一(B级)
(一)计算题:
(1)23+(-73)
(2)(-84)+(-49)
(3)7+(-)
(4)+(-)
(5)(-7/3)+(-7/6)
(6)9/4+(-3/2)
(7)+()+5/4
(8)-+(+5/4)+(-)
(二)用简便方法计算:
(1)(-17/4)+(-10/3)+(+13/3)+(11/3)
(2)(-)+(+)+(-)+()+(+)+(+)
(三)已知:X=+17(3/4),Y=-9(5/11),Z=-,
求:(-X)+(-Y)+Z的值
(四)用“>“,“0,则a-ba (C)若ba (D)若a<0,ba
(二)填空题:
(1)零减去a的相反数,其结果是_____________; (2)若a-b>a,则b是____________