(-0.5)+(9/4)+(-19/2)+(9.75) 怎么算
问题描述:
(-0.5)+(9/4)+(-19/2)+(9.75) 怎么算
答
(-0.5)+(9/4)+(-19/2)+(9.75)
=-0.5+2.25-9.5+9.75
=-(0.5+9.5)+(2.25+9.75)
=-10+12
=2