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七年级数学有理数的除法第9节_第1课时课件新人教版.ppt

七年级数学有理数的除法第9节_第1课时课件新人教版.ppt

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七年级数学有理数的除法第9节_第1课时课件新人教版

6.4.2 有理数的除法(1) 新人教-初中数学-六年级第二学期多媒体教学课件 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 填一填 a a的倒数 -5 1 -1 0 6 1 -1 / 0.5 2 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 回忆在小学中你学过的除法运算 除法是已知两个因数的积与其中一个因数,求另一个因数的运算。除法是乘法的逆运算。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. -6 -3 -3 填空并思考: (-3)× 2= ____ (-3)× (- 2 ) = ____ ____ × 2= -6 6 -2 6÷ (-3)= ___ (-6) ÷ 2= ___ 你有新的发现吗? (-6) × = 6 ×( )= 另外: -3 -2 (-6) ÷ 2= (-6)× 6÷(-3)= 6 ×( ) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 除以一个不等于0数,等于乘这个数的倒数 一般地,有理数的乘法与除法之间有以下关系: Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 例1:计算 (1)(-18)÷(-6) =3 解法二: 解:原式=+( ) =3 =-3 = - 3 解:原式=(-18)×( ) (2)( )÷(+ ) (3) ÷( ) 解:原式= ×( ) = 解:原式=( )×(+5) 解:原式=-( ) = - ( ×5 ) 解:原式= - ( ÷ ) = -( × ) = 18÷6 ÷ 你发现了? Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET

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