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义务教育人教版实验教材四年级下册数学.ppt

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义务教育人教版实验教材四年级下册数学宁波大学教师教育学院赵依丹 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 同学们要在一段全长 1000 米的小路一边植树,每隔 5米栽一棵( 两端要栽)。一共需要多少棵树苗? Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 200 ? 201 ? 199 ?还是… Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 要在一段全长 20米的小路一边植树,每隔5米栽一棵( 两端要栽)。一共需要多少棵树苗? 30 米? 50 米呢? … Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 植树棵数=间隔数+1 间隔数=植树棵数-1 全长(米) …间隔长度(米) 间隔数植树棵数(棵) … 20 5 4 56 50 510 全长÷间隔长度=间隔数 30 57 11 (两端栽种) Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 在一段全长 1000 米的小路一边植树,每隔5米栽一棵( 两端要栽)。一共需要多少棵树苗? 1000 ÷ 5=200 200+1=201 (棵) 答:一共需要 201 棵树苗。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 园林工人沿长为

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