(1)23+(-73)= (2)(-84)+(-49)= (3)7+(-2.04)= (4)4.23+(-7.57)=
(5)(-7/3)+(-7/6)= (6)9/4+(-3/2)= (7)3.75+(2.25)+5/4=
(8)-3.75+(+5/4)+(-1.5)=
(二)用简便方法计算:
(1)(-17/4)+(-10/3)+(+13/3)+(11/3)
(2)(-1.8)+(+0.2)+(-1.7)+(0.1)+(+1.8)+(+1.4)
(三)已知:X=+17(3/4),Y=-9(5/11),Z=-2.25, 求:(-X)+(-Y)+Z的值 下载本文