有理数的加减法,3Q12+(-3)-(+15)-(-4)

问题描述:

有理数的加减法,3Q
12+(-3)-(+15)-(-4)

=9-(+15)-(-4) =9-15+4 =-2

=9-15+4
=-6+4
=-2

12+(-3)-(+15)-(-4)
=12-3-15+4
=10-15+4
=-2

=12-3-15+4=-2