(-59/7)+(-7.5)+(-151/7)+(7/2)= -0.5-(-13/4)+2.75-(+15/2)=

问题描述:

(-59/7)+(-7.5)+(-151/7)+(7/2)= -0.5-(-13/4)+2.75-(+15/2)=

(-59/7-151/7)+(7/2-7.5)=-210/7-4=-34
-0.5-(-13/4)+2.75-(+15/2)=-0.5+13/4+2.75-15/2=(-1/2-15/2)+(13/4+11/4)=-8+6=-2