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The real number of math problems in the second day of junior high school
1. The root number 13 equals 3 points, so m=3, n= (root number 13)-3.

So m-n=3- ((root number 13)-3)=6- root number 13.

2. Let the right-angled side length be a, then x+x+ (root number 2)x=2x+ (root number 2)x=2+ root number 2, so x= 1, so the side length of the isosceles right-angled triangle is 1, and the area is12.