a与b互为相反数,则a+b=0 a= -b则a+b=0 ,a/b= （-b）/b= -1( b≠0)
互为相反数，就是两个数加起来得0，a=-b，b=-a
a+b=0a/b=-1
a + b = 0a/b=-1
a+b=0 ,a/b=-1 ( b≠0)
