52 sum round etc

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52.1 Introduction

52.2 Exercises

52.2.1 Question 1

52.2.2 Question 2

52.2.3 Question 3

52.2.4 Question 4

52.2.5 Question 5

52.2.6 Question 6

52.2.7 Question 7

52.2.8 Question 8

52.2.9 Question 9

52.2.10 Question 10