计算:(1) (+2)+(-8) (2) (-8.8)-(+7) (3) (46.45)+(-5.25)+18.54+(+5 1/4)

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 21:39:44

计算:(1) (+2)+(-8) (2) (-8.8)-(+7) (3) (46.45)+(-5.25)+18.54+(+5 1/4)
计算:(1) (+2)+(-8) (2) (-8.8)-(+7) (3) (46.45)+(-5.25)+18.54+(+5 1/4)

计算:(1) (+2)+(-8) (2) (-8.8)-(+7) (3) (46.45)+(-5.25)+18.54+(+5 1/4)
(1) (+2)+(-8)
=2-8
=-6
(2) (-8.8)-(+7)
=-8.8-7
=-15.8
(3) (46.45)+(-5.25)+18.54+(+5又1/4)
=(46.45+18.54)+(-5.25+5又1/4)
=64.99

(1) (+2)+(-8)=2-8=-6
(2) (-8.8)-(+7)=-8.8-7=-15.8
(3) (46.45)+(-5.25)+18.54+(+5 1/4)
=(46.45+18.54)+(5.25-5.25)
=64.99+0
=64.99

(1):原式=2-8=-6
(2):原式=-8.8-7=-15.8
(3):原式=46.45-5.25+18.54+5 1/4=41.2+18.54+5.25=64.99