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How to solve the problem on page 24 of Pythagorean Theorem, the first volume of eighth grade of Beijing Normal University Edition?
10/2=5 (feet)

The length of the solution pool is x feet.

(x+ 1)^2-x^2=5^2

x^2+ 1+2x-x^2=25

2x=25- 1

x= 12

Reed: 12+ 1= 13 (feet)

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