Sum of the problem on the data link

Users questions: Hello, everybody. How does a work of a few thin sheet sum, such as each worksheet can have one or several data, how to link these data together, the input Qiuhu formula, with the mouse click on the appropriate data , you can sum. I just tried it, do not know where to improper operation or Other reasons, and sometimes I return to the last point that the number of times the data table is the final sum. Annex are as follows:
Experts answer: Cinderella Hello: You can "jinwa1718 school girl," the answer simplified formula = SUM (Sheet1: Sheet3! A1) here Thank the old application, the help he gave me so that we learn a simplified formula. I wish you: learning progress, and work well!
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