(-64)+17+(-23)+68=?怎么写一步步写出来 详细步骤、不太懂

问题描述:

(-64)+17+(-23)+68=?怎么写
一步步写出来 详细步骤、不太懂

(-64)+17+(-23)+68 =[(-64)+(-23)]+(68+17) =-87+85 =-2.

(-64)+17+(-23)+68 =(-64)+17+(-4)+(-19)+68 =(-68)+68+17+(-19) =0+17+(-19) =-2