四年级下册数学同步练习-6单元2课时 用加法运算律进行简便计算-苏教版解析
http://t.cn/Ri466E4【精品】第6单元第2课时加法运算定律进行简便计算(练习及解析)苏教版-四年级数学下册一、填空1.用字母a,b,c表示加法结合律:().【解析】加法结合律的含义是:三个数相加,先把前两个数相加,再和第三个数相加,或者先把后两个数相加,在和第一个数相加,和不变,这叫做加法结合律。用字母a,b,c表示:a+b+c=(a+b)+c=a+(b+c)【答案】(a+b)+c=a+(b+c)2.368+160+132=(368+132)+160是应用了( )律。【解析】有两个加数相加,交换加数的位置,和不变,这叫做加法交换律。三个数相加,先把前两个数相加,...
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