第1个回答 2016-12-03
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/730e0cf3d7ca7bcb41311c39b7096b63f624a85a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
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第2个回答 2023-03-05
57乘以53怎么巧算:
57×53
=50×53+7×53
=50×50+50×3+7×50+7×3
=2500+150+350+21
=2500+500+21
=3021
第3个回答 2016-12-03
=(55十2)(55一2)
=55^2一2^2
=3025一4
=3021本回答被网友采纳
第4个回答 2016-12-03
=(60—3)×(50+3)
=3000+180—150—9
=3021本回答被网友采纳
第5个回答 2023-03-08
57×53
=(55+2)(55-2)
=55²-4
=3025-4
=3021