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四年级数学下册1—1
绿色圃中小学教育网 * 四则运算 (一) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 滑冰场上午有72人,中午有44人离去,又有85人到来。现在有多少人? 怎样列式计算呢? 中午有44人离去, 用减法计算。 又有 85人到来。 用加法计算。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 滑冰场上午有72人,中午有44人离去,又有85人到来。现在有多少人? 72-44=28 28+85=113 72-44+85=113 答:现在有113人在滑冰。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 右边说,左边听 100+45-65 左边说,右边听 120-84+16 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 在没有括号的算式里,如果只有加法、减法运算,要从左到右按顺序计算。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. “冰雪天地”3天接待987人。 照这样计算,6天预计接待多少人? Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. “冰雪天地”3天接待987人。 照这样计算,6天预计接待多少人? 987人 ?人 3天: 6天: 列式:987÷3×6 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 列式:987÷3×6 987÷3×6 = 329×6 = 1974(人) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. “冰雪天地”3天接待987人。 照这样计算,6天预计接待多少人? 987人 ?人 3天: 6天: 列式:6÷3×987 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 列式:6÷3×987 6÷3×987 = 2×987 = 1974(人) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 72-44+85=113 987÷3×6 = 329×6 = 1974(人) 6÷3×987 = 2×987 = 1974(人) 在没有括号的算式里,如果只有加、减法或者只有乘除法,都要从左往右按顺序计算。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile . Copyright 2004-2011 Aspose Pty Ltd. 右边说,左边听 100+45-65 左边说,右边听 120-84+16 Evaluation only. Created with Aspose.Slid
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