(-3.6)+(+2.7)+(-0.4)+2又8分之7+(+13)+(-1又8分之7)

问题描述:

(-3.6)+(+2.7)+(-0.4)+2又8分之7+(+13)+(-1又8分之7)

(-3.6)+(+2.7)+(-0.4)+2又8分之7+(+13)+(-1又8分之7)
=-3.6+2.7-0.4+8分之23-8分之15+13
=13+2.7-(3.6+0.4)+8分之8
=15.7-4+1
=12.7