(3.75)-(2.85)+(1.25)-(0.5)+3.15-(+2.5)等于多少?
问题描述:
(3.75)-(2.85)+(1.25)-(0.5)+3.15-(+2.5)等于多少?
答
=3.75+1.25+(3.15-2.85)-(2.5+0.5)
=5+0.3-3=2.3