解：22.9-9.46+15.66
=22.9+15.66-9.46
=22.9+(15.66-9.46)
=22.9+6.2
=29.1
你好！根据描述得到:22.9-9.46+15.66＝22.9-9.46+（9.46+6.2）＝22.9-9.46+9.46+6.2＝22.9+6.2=29.1希望能帮到你！
=22.9+6.2=29.1
