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

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