题目内容
用所学规律算一算. 125×54×8 |
(125+15)×8 | 32×125×6. |
分析:(1)运用乘法交换律简算;
(2)运用乘法分配律简算;
(3)先把32分成8×4,再运用乘法结合律简算.
(2)运用乘法分配律简算;
(3)先把32分成8×4,再运用乘法结合律简算.
解答:解:(1)125×54×8,
=125×8×54,
=1000×54,
=54000;
(2)(125+15)×8,
=125×8+15×8,
=1000×120,
=1120;
(3)32×125×6,
=8×4×125×6,
=(8×125)×(6×4),
=1000×24,
=24000.
=125×8×54,
=1000×54,
=54000;
(2)(125+15)×8,
=125×8+15×8,
=1000×120,
=1120;
(3)32×125×6,
=8×4×125×6,
=(8×125)×(6×4),
=1000×24,
=24000.
点评:运算定律是常用的简便运算的方法,要熟练掌握,灵活运用.
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