题目内容

怎样简便就怎样算;
168+52+48 125×72 (4+8)×25 125×32×8 136×99 156×l0l-156.
分析:(1)运用加法结合律简算;
(2)先把72分解成8×9,再运用乘法结合律简算;
(3)运用乘法分配律简算;
(4)运用乘法交换律简算;
(5)先把99分解成100-1,再运用乘法分配律简算;
(6)运用乘法分配律简算.
解答:解:(1)168+52+48,
=168+(52+48),
=168+100,
=268;

(2)125×72,
=125×8×9,
=1000×9,
=9000;

(3)(4+8)×25,
=4×25+8×25,
=100+200,
=300;

(4)125×32×8,
=125×8×32,
=1000×32,
=32000;

(5)136×99,
=136×(100-1),
=136×100-136×1,
=13600-136,
=13464;

(6)156×l0l-156,
=156×(101-1),
=156×100,
=15600.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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