能简便要简便:10-24-15+26-42+18=? -4.2+5.7-7.6+10.1-5.5=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/29 08:06:16
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能简便要简便:10-24-15+26-42+18=? -4.2+5.7-7.6+10.1-5.5=?
能简便要简便:10-24-15+26-42+18=? -4.2+5.7-7.6+10.1-5.5=?
能简便要简便:10-24-15+26-42+18=? -4.2+5.7-7.6+10.1-5.5=?
10-24-15+26-42+18=?
=(10+26+18)-(24+15+42)
=54-81
=-27
-4.2+5.7-7.6+10.1-5.5
=(5.7+10.1)-(4.2+7.6+5.5)
=15.8-17.3
=-1.5