0-1/2-(+2/5)-(-3/4)-(+1/4)等于多少?

问题描述:

0-1/2-(+2/5)-(-3/4)-(+1/4)等于多少?

0-1/2-(+2/5)-(-3/4)-(+1/4)
=0-1/2-2/5+3/4-1/4
=(3/4-1/2-1/4)-2/5
=0-2/5
=-2/5