![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/71cf3bc79f3df8dc56a38c1fc811728b461028a5?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
追答听不到
追问题目看不懂。
追答就是让你算10+12+14+16+……+56+58=?
错了
10+12+14+16+……+46+48=?
追问但是要简写怎么办?
追答![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/500fd9f9d72a60592a12e8942d34349b033bba39?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
第二种方法写错了
10+48+12+46+14+44+……28+30=58*10=580
追问我还有一个问题想请教您:一根彩带,第一次你用去全长的4/7,第二次用去第一次的一半。这根彩带还剩下全长的几分之几?您可以回答我吗?
谢谢啦!
追答![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/95eef01f3a292df5b289d99bb9315c6035a873f1?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
给个评价吧呵呵
追问真棒,你怎么那么厉害?你是谁?
追答呵呵,这个很简单啊