简便计算:15.37x7.88-9.37x7.88-15.37x2.12+9.37x2.12
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/22 12:30:59
简便计算:15.37x7.88-9.37x7.88-15.37x2.12+9.37x2.12
急急急!明天就要交了!
急急急!明天就要交了!
15.37x7.88-9.37x7.88-15.37x2.12+9.37x2.12
=(15.37x7.88-15.37x2.12)+(9.37x2.12-9.37x7.88)
=15.37×(7.88-2.12)-9.37×(2.12-7.88)
=15.37×(7.88-2.12)+9.37×(7.88-2.12)
=(7.88-2.12)×(15.37-9.37)
=5.76×6
=34.56
你再检查一下题目,符号是不是错了
=(15.37x7.88-15.37x2.12)+(9.37x2.12-9.37x7.88)
=15.37×(7.88-2.12)-9.37×(2.12-7.88)
=15.37×(7.88-2.12)+9.37×(7.88-2.12)
=(7.88-2.12)×(15.37-9.37)
=5.76×6
=34.56
你再检查一下题目,符号是不是错了
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