文档介绍:九年义务课程标准实验教科书二年级上册加减混合运算 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 口算下列各题: 41-2= 26+3= 59-9= 65+8= 38-5= 5+43= 70-4= 18+5= 16+80= 20+39= 47-6= 73+7= 95-8= 82-50= 70-40= 7+36= Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 车上原来有 67人, 现在有多少人? 例1: Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 例1: 车上原有 67 人有 28 人上车现在车上有多少人? 有 25 人下车 42+28= (人) 综合算式怎么列呢? 6 7 - 2 5 4 2 现在车上有多少人? 车上有 42 人, 4 2 +2 1 8 70 4 2 67-25= (人) 70 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 你们还有其他解答方法吗? 例1:有 28 人上车,现在车上有多少人? 95 - 25 = (人) () 6 7 + 2 8 70 有 25 人下车车上原来有 67 人 67 + 28= (人) 95 () 9 5 - 2 5 7 0 9 5 67 + 28 - 25 = 9 5 6 7 + 2 8 0 - 2 5 7 70 (人) Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 例1: 车上原有 67 人有 28 人上车,现在车上有多少人? 有 25 人下车车上原来有 67 人还有其他方法吗? 28 - 25 + 67= 70 (人) Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyrigh