用简算8.38+9.43+6.62.5.86-1.77+2.54.47.2+8.6-7.2

来源:学生作业学帮网 编辑:学帮网 时间:2024/06/01 11:06:35

用简算8.38+9.43+6.62.5.86-1.77+2.54.47.2+8.6-7.2

8.38+9.43+6.62.
=8.38+6.62+9.43
=15+9.43
=24.43
5.86-1.77+2.54.
=5.86+2.54-1.77
=8-1.77
=6.23
47.2+8.6-7.2
=47.2-7.2+8.6
=40+8.6
=48.6