-0.5-3又4分之1+2.75-(+7又2分之1)最好给我讲一下.
问题描述:
-0.5-3又4分之1+2.75-(+7又2分之1)
最好给我讲一下.
答
-0.5-3又4分之1+2.75-(+7又2分之1)
=-0.5-3.25+2.75-7.5
=(2.75-3.25)-(0.5+7.5)
=-0.5-8
=-8.5
答
-0.5-3又4分之1+2.75-(+7又2分之1)
=-0.5-3.25+2.75-7.5
=-(0.5+3.25-2.75+7.5)
=-(3.75-2.75+7.5)
=-(1+7.5)
=-8.5