第1个回答 2018-11-29
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/a50f4bfbfbedab64f7dc8b8afa36afc378311eca?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
看图
第2个回答 2018-11-29
.5/19×18+5/19
=5/19×(18+1)
=5/19×19
=5
分析:
利用乘法结合律本回答被网友采纳
第3个回答 2018-11-29
19分之5乘13分之6加19分之7乘13分之5简便计算19分之5乘13分之6加19分之7乘13分之5=6/13*5/19+7/19*5/13=6/13*5/19+7/13*5/19=5/19*(6/13+7/13)=5/19本回答被网友采纳
第4个回答 2018-11-29
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/ae51f3deb48f8c540753036537292df5e1fe7ffc?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
这样子
第5个回答 2023-03-16
=5/19*18+5/19
=5/19*(18+1)
=5/19*19
=5