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第一讲:速算与巧算 乘法运算 1乘法交换律:a×b= b×a 2乘法结合律:(a×b)×c = a×(b×c) 3乘法分配律:(a±b)×c = a×c ± b×c 复习 2×5=10 4×25=100 牢记并灵活运用 8×125=1000 17×4×25 125×19×8
Created with an evaluation copy of . To discover the full versions of our APIs please visit: :
Created with an evaluation copy of . To discover the full versions of our APIs please visit: :
Created with an evaluation copy of . To discover the full versions of our APIs please visit: :
Created with an evaluation copy of . To discover the full versions of our APIs please visit: :
Created with an evaluation copy of . To discover the full versions of our APIs please visit: :
Created with an evaluation copy of . To discover the full versions of our APIs please visit: :
三年级数学一画笔就是能够一笔画成的图形这里的一笔要求下笔后笔不离开纸面而且每条只能画一次我们知道任何图形都是由点和线段组成图形中的点可以分为两大类从一点出发的线的条数是双数这点成为双数点也成为偶点从一个点出发的线段的条数是单数这点称为单数点也成为奇点一个图形能否一笔画成关键在于图形中的单数点(奇点)的个数如果图形中没有单数点(奇点)一定可以一笔画完图形中若有两个单数点(奇点)也可以一笔画成单数点(
三年级暑期数学思维训练第九讲 基础知识过关1钟面上有3根针它们是( )( )( )其中走得最快的是( )走得最慢的是( )2钟面上有( )个数字(
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