(+2/7)+(-5/2)+(-12/7)+(+2.5)+(-0.125)+(-19/8)

问题描述:

(+2/7)+(-5/2)+(-12/7)+(+2.5)+(-0.125)+(-19/8)

(+2/7)+(-5/2)+(-12/7)+(+2.5)+(-0.125)+(-19/8)
=[(+2/7)+(-12/7)]+[(-5/2)+(+2.5)]+[(-0.125)+(-19/8)]
=(2/7-12/7)+(-2.5+2.5)-(1/8+19/8)
=-10/7+0-5/2
=-(10/7+5/2)
=-55/14