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How to write the question 10 on page 15 of the second volume of the fifth grade math book (interesting triangle)
4/ 1 = 4/ 1

4/ 1 4/ 1 = 2/ 1

4/ 1 4/2 4/ 1 = 1

4/ 1 4/2 4/3 4/ 1 =4/7

4/ 1 4/2 4/3 4/4 4/ 1 =4/ 1 1

4/ 1 4/2 4/3 4/4 4/5 4/ 1 =4

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