（+2/7)+(-5/2)+(-12/7)+(+2.5)+(-0.125)+(-19/8) 简便计算
问题描述：
（+2/7)+(-5/2)+(-12/7)+(+2.5)+(-0.125)+(-19/8) 简便计算
答
(+2/7) + (-5/2) + (-12/7) + (+2.5) + (-0.125) + (-19/8)
= 2/7 - 2.5 - 12/7 + 2.5 - 1/8 - 19/8
= -10/7 -20/8
= -( 10/7 + 5/2 )
= -( 20/14 + 35/14 )
= -55/14