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20 14 third year of mathematics in Dongcheng Second Mode
The sum of the third-order magic squares is 3×5= 15,

The number in the upper right corner is 15-5-8=2.

a= 15-2-9=4，

The number on the left of 5 is 15-8-4=3.

b= 15-5-3=7，

a-b=4-7=-3，

So choose: a.

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