73.06-[□×（4.465+5.535）+42.06]=3．问：□等于多少？

Question

73.06-[□×（4.465+5.535）+42.06]=3．问：□等于多少？

Answer 1

73.06-[□×（4.465+5.535）+42.06]=3
                73.06-[□×10+42.06]=3
                    73.06-42.06-10□=3
                             31-10□=3
                                10□=31-3
                                10□=28
□=28÷10
□=2.8．
答：□等于2.8．