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