1、点击D2单元格,输入:=TEXTJOIN("/",,TRIM(MID(SUBSTITUTE(B2,"/",REPT(" ",100)),{1,2,3}*100-99,20))*C2),按enter键结束

2、点击D2单元格,下拉完成公式填充

3、公式讲解。TRIM(MID(SUBSTITUTE(B2,"/",REPT(" ",100)),{1,2,3}*100-99,20))返回{"1","20","50"}

4、TEXTJOIN("/",,{"1","20","50"}*C2)返回"2/40/100"
TEXTJOIN函数使用分隔符/连接列表或文本字符串区域
