题目内容
简便计算.
125×32×25 | 0.53×6.7+5.3×0.43-0.53 | (![]() ![]() |
解:①125×32×25,
=(125×8)×(4×25),
=1000×100,
=100000;
②0.53×6.7+5.3×0.43-0.53,
=0.53×6.7+0.53×4.3-0.53,
=0.53×(6.7+4.3-1),
=0.53×10,
=5.3;
③(
×
)×(12×17),
=(
)×(
),
=5×6,
=30.
分析:①125×32×25,将原式转化为:125×8×4×25,再运用乘法结合律进行简算;
②0.53×6.7+5.3×0.43-0.53,将原式转化为:0.53×6.7+0.53×4.3-0.53,然后运用乘法分配律进行简算;
③(
×
)×(12×17),运用乘法交换律和结合律进行简算.
点评:此题考查的目的是理解掌握乘法交换律、结合律、分配律的意义,并且能够灵活运用乘法的运算定律进行简便计算.
=(125×8)×(4×25),
=1000×100,
=100000;
②0.53×6.7+5.3×0.43-0.53,
=0.53×6.7+0.53×4.3-0.53,
=0.53×(6.7+4.3-1),
=0.53×10,
=5.3;
③(


=(


=5×6,
=30.
分析:①125×32×25,将原式转化为:125×8×4×25,再运用乘法结合律进行简算;
②0.53×6.7+5.3×0.43-0.53,将原式转化为:0.53×6.7+0.53×4.3-0.53,然后运用乘法分配律进行简算;
③(


点评:此题考查的目的是理解掌握乘法交换律、结合律、分配律的意义,并且能够灵活运用乘法的运算定律进行简便计算.

练习册系列答案
相关题目