If I want to compute Double Integral on a given region(See attached Picture)

How can I input this on Wolfram Alpha Notebook

enter image description here

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    $\begingroup$ integrate[integrate[1/(x+y)^3,{x,1,3-y}],{y,1,2}] Check that very carefully to make certain that I haven't made any mistake. $\endgroup$
    – Bill
    Feb 28, 2021 at 9:07
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    $\begingroup$ integrate[1/(x+y)^3,{y,1,2},{x,1,3-y}] is another way of doing the same thing, but the order in which you give the y and x values is very important. $\endgroup$
    – Bill
    Feb 28, 2021 at 11:32
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    $\begingroup$ Welcome to Mathematica.SE! I suggest the following: 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Take the tour! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign! $\endgroup$
    – Michael E2
    Feb 28, 2021 at 15:44
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    $\begingroup$ Please post your code,not the picture,thanks. $\endgroup$
    – cvgmt
    Mar 1, 2021 at 2:59
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    $\begingroup$ I’m voting to close this question because questions about Wolfram|Alpha that are not related to Mathematica are off-topic on this site. $\endgroup$
    – Szabolcs
    Mar 21, 2021 at 17:46