35×25×4??????????25×166×4??????????8×(25×15)
20×72×5??????????15×11×2???????????71×8×5
39×20×5??????????15×3×4????????????125×7×4.
35×25×4??????????25×166×4??????????8×(25×15)20×72×5??????????15×11×2???????????71×8
答案:2 悬赏:40 手机版
解决时间 2021-01-08 07:03
- 提问者网友:一抹荒凉废墟
- 2021-01-08 02:26
最佳答案
- 五星知识达人网友:患得患失的劫
- 2020-10-23 18:14
解:
(1)35×25×4,
=35×(25×4),
=35×100,
=3500;
(2)25×166×4,
=25×4×166,
=100×166,
=16600;
(3)8×(25×15),
=(8×25)×15,
=200×15,
=3000;
(4)20×72×5,
=20×5×72,
=100×72,
=7200;
(5)15×11×2,
=15×2×11,
=30×11,
=330;
(6)71×8×5,
=71×(8×5),
=71×40,
=2840;
(7)39×20×5,
=39×(20×5),
=39×100,
=3900;
(8)15×3×4,
=15×4×3,
=60×3,
=180;
(9)125×7×4,
=125×4×7,
=500×7,
=3500.解析分析:(1)根据乘法结合律进行计算;
(2)根据乘法交换律进行计算;
(3)根据乘法结合律进行计算;
(4)根据乘法交换律进行计算;
(5)根据乘法交换律进行计算;
(6)根据乘法结合律进行计算;
(7)根据乘法结合律进行计算;
(8)根据乘法交换律进行计算;
(9)根据乘法交换律进行计算.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.
(1)35×25×4,
=35×(25×4),
=35×100,
=3500;
(2)25×166×4,
=25×4×166,
=100×166,
=16600;
(3)8×(25×15),
=(8×25)×15,
=200×15,
=3000;
(4)20×72×5,
=20×5×72,
=100×72,
=7200;
(5)15×11×2,
=15×2×11,
=30×11,
=330;
(6)71×8×5,
=71×(8×5),
=71×40,
=2840;
(7)39×20×5,
=39×(20×5),
=39×100,
=3900;
(8)15×3×4,
=15×4×3,
=60×3,
=180;
(9)125×7×4,
=125×4×7,
=500×7,
=3500.解析分析:(1)根据乘法结合律进行计算;
(2)根据乘法交换律进行计算;
(3)根据乘法结合律进行计算;
(4)根据乘法交换律进行计算;
(5)根据乘法交换律进行计算;
(6)根据乘法结合律进行计算;
(7)根据乘法结合律进行计算;
(8)根据乘法交换律进行计算;
(9)根据乘法交换律进行计算.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.
全部回答
- 1楼网友:像个废品
- 2019-10-21 13:06
对的,就是这个意思
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