82.8+(82.8-7.24)怎么简便请竟快回答

82.8+(82.8-7.24)
=82.8+82.8-7.24
=82.8×2-7.24
=165.6-7.24
=158.36

82.8+(82.8-7.24)
=82.8+82.8-7.24
=80+2.8+80+2.8-7-0.24
=（80+80-7）+（2.8+2.8-0.24)
=153+5.36
=158.36

用计算器输入82.8+82.8-7.24=?

82.8+(82.8-7.24)
=82.8-82.8+7.24
=0+7.24
=7.24