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填空题
On Mindy's guitar, the frequency of a vibrating string varies inversely as the length of the string. When a guitar string of s inches in length that vibrates at a frequency of 80 cycles per second is shortened to 6 inches in length, it vibrates at a frequency of 120 cycles per second. What is the value of s?____
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解析：
根据题干可列出等式alb1＝a2b2，(s)(80)＝(6)(120)，s=9。
根据题干可列出等式alb1＝a2b2，(s)(80)＝(6)(120)，s=9。
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