题目内容

下面各题怎样简便就怎样算.
472+66+134
324+75+46+25+54
283+36+64+1715+57+185
125+75+26+7498+(24+102)

解:(1)472+66+134,
=472+(66+134),
=472+200,
=672;

(2)324+75+46+25+54,
=324+(75+25)+(54+46),
=324+100+100,
=524;

(3)283+36+64+17,
=(283+17)+(36+64),
=300+100,
=400;

(4)15+57+185,
=(15+185)+57,
=200+57,
=257;

(5)125+75+26+74,
=(125+75)+(26+74),
=200+100,
=300;

(6)98+(24+102),
=98+24+102,
=(98+102)+24,
=200+24,
=224.
分析:(1)(4)(6)运用加法交换律简算;
(2)(3)运用加法交换律与结合律简算;
(5)运用加法结合律简算.
点评:完成此题,应注意分析式中数据,运用所学的运算定律或性质,进行简算.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网