To make the inequality (7/5)＜(17/(()))＜(10/7) true, what is the integer that should be filled in how many? (Hint: Since all three molecules are known, convert them into fractions of the same molecule)
要使不等式(7/5)＜(17/(()))＜(10/7)成立，多少里应填的整数是多少？(提示：由于三个分子都是已知的，化成同分子的分数)
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