负0.5减负3又4分之1加2.75减7又2分之1
问题描述:
负0.5减负3又4分之1加2.75减7又2分之1
答
负0.5减负3又4分之1加2.75减7又2分之1
=(-0.5-7又1/2)+(3又1/4+2.75)
=-8+6
=-2