简便计算.(1)37+128+53+72+10(2)25×8×125×4(3)25×64(4)(125×6)×72(5)125×88(6)7×125×25×32.

发布时间:2020-08-09 13:32:55

简便计算.
(1)37+128+53+72+10
(2)25×8×125×4
(3)25×64
(4)(125×6)×72
(5)125×88
(6)7×125×25×32.

网友回答

解:(1)37+128+53+72+10,
=(128+72)+(37+53+10),
=200+100,
=300;

(2)25×8×125×4,
=(25×4)×(8×125),
=100×1000,
=100000;

(3)25×64,
=25×4×16,
=100×16,
=1600;

(4)(125×6)×72,
=125×8×6×9,
=1000×54,
=54000;

(5)125×88,
=125×80+125×8,
=10000+1000,
=11000;

(6)7×125×25×32,
=7×(125×8)×(25×4),
=7×1000×100,
=700000.
解析分析:(1)运用加法交换律和结合律解答;
(2)运用乘法交换律和结合律解答;
(3)化64=4×16,再运用乘法结合律解答;
(4)化72=8×9,再运用乘法结合律解答;
(5)运用乘法分配律解答;
(6)化32=8×4,再运用乘法交换律和结合律解答.

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