四年级下册数学同步练习-6单元1课时-加法交换律和结合律-苏教版
http://t.cn/Ri466E4新苏教版小学数学四年级下册《加法交换律和结合律》同步练习及参考答案一、选择题。125+67+75=67+(125+75)应用了()A.加法交换律B.加法结合律C.加法交换律和加法结合律2.25+38+75=38+(25+75),这里运用了()A.加法交换律B.加法结合律C.加法交换律和结合律二、解答题。1.举例说说加法交换律、加法结合律。.2.根据加法的交换律,在口中填上适当的数:①75+63=63+口②120+60=口+12O③123+862+257=123+257+口④90+a=口+90⑤a+b=口+a⑥a+口=26十口3.计算下面各题并验算。教育1h...
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