y Ltd. Copyright 2004-2011 Aspose Pty Ltd. 小结:在没有括号的算式里,只有加、减法或只有乘、除法, 都要从左往右按顺序计算。 23 +6- 11 == 2 ×8÷4== 72 ÷8÷3== 三、巩固练习三、巩固练习(一) 计算问题:想一想,说一说,先算什么?再算什么? 29 18 119 1644 33 -÷÷ Evaluation only. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 15 -6+4= 15 - 10 =5 2×6÷3=2×2=4 2×3×4=6× 4 = 24 三、巩固练习三、巩固练习(二) 下面的计算对吗?如果不对,把它改正过来问题:谁读懂题目的意思了? √×× 15 -6+ 4 =9+ 4 = 13 2×6÷3= 12 ÷ 3 =4 Evaluation only. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd.
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