根据运算定律简便计算下列各题.64×125×525×404(125-36)×80302+(729+98)+12711818+81×18+18
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发布时间:2022-05-06 12:36
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时间:2023-10-09 13:20
(1)64×125×5
=8×8×125×5
=8×125×5×8
=(8×125)×(5×8)
=1000×40
=40000;
(2)25×404
=25×4×101
=100×101
=10100;
(3)(125-36)×80
=125×80-36×80
=10000-2880
=7120;
(4)302+(729+98)+1271
=302+729+98+1271
=(302+98)+(1271+729)
=400+2000
=2400;
(5)1818+81×18+18
=18×101+81×18+18
=18×(101+18+1)
=18×120
=2160.